fix(clerk-js): Backport iframe __client_uat cookie domain fix#7882

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Merged
brkalow merged 1 commit into from
Feb 18, 2026
Merged

fix(clerk-js): Backport iframe __client_uat cookie domain fix #7882

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5 changes: 5 additions & 0 deletions .changeset/fix-iframe-client-uat-cookie-domain.md
View file
Open in desktop
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,5 @@
---
'@clerk/clerk-js': patch
---

Fix `__client_uat` cookie being set on two different domain scopes when app is loaded in both iframe and non-iframe contexts. `getCookieDomain()` now falls back to `hostname` instead of `undefined` when the eTLD+1 probe fails, and the eTLD+1 probe uses the same `SameSite`/`Secure` attributes as the actual cookie to ensure consistent behavior across contexts.
17 changes: 15 additions & 2 deletions packages/clerk-js/src/core/auth/__tests__/getCookieDomain.test.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -35,6 +35,19 @@ describe('getCookieDomain', () => {
expect(result).toBe(hostname);
});

it('passes cookie attributes to the probe', () => {
const hostname = 'app.example.com';
const handler: CookieHandler = {
get: vi.fn().mockReturnValueOnce(undefined).mockReturnValueOnce('1'),
set: vi.fn().mockReturnValue(undefined),
remove: vi.fn().mockReturnValue(undefined),
};
const attrs = { sameSite: 'None', secure: true };
getCookieDomain(hostname, handler, attrs);
expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'example.com' });
expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'app.example.com' });
});

it('handles localhost', () => {
const hostname = 'localhost';
const result = getCookieDomain(hostname);
Expand All@@ -53,15 +66,15 @@ describe('getCookieDomain', () => {
expect(getCookieDomain('bryce-local')).toBe('bryce-local');
});

it('returns undefined if the domain could not be determined', () => {
it('falls back to hostname if the domain could not be determined', () => {
const handler: CookieHandler = {
get: vi.fn().mockReturnValue(undefined),
set: vi.fn().mockReturnValue(undefined),
remove: vi.fn().mockReturnValue(undefined),
};
const hostname = 'app.hello.co.uk';
const result = getCookieDomain(hostname, handler);
expect(result).toBeUndefined();
expect(result).toBe(hostname);
});

it('uses cached value if there is one', () => {
Expand Down
2 changes: 1 addition & 1 deletion packages/clerk-js/src/core/auth/cookies/clientUat.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -45,7 +45,7 @@ export const createClientUatCookie = (cookieSuffix: string): ClientUatCookieHand
: 'Strict';
const secure = getSecureAttribute(sameSite);
const partitioned = __BUILD_VARIANT_CHIPS__ && secure;
const domain = getCookieDomain();
const domain = getCookieDomain(undefined, undefined, { sameSite, secure });

// '0' indicates the user is signed out
let val = '0';
Expand Down
27 changes: 22 additions & 5 deletions packages/clerk-js/src/core/auth/getCookieDomain.ts
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,19 @@ import { createCookieHandler } from '@clerk/shared/cookie';
let cachedETLDPlusOne: string;
const eTLDCookie = createCookieHandler('__clerk_test_etld');

export function getCookieDomain(hostname = window.location.hostname, cookieHandler = eTLDCookie) {
/**
* @param hostname - The hostname to determine the eTLD+1 for.
* @param cookieHandler - The cookie handler to use for the eTLD+1 probe.
* @param cookieAttributes - Optional cookie attributes (sameSite, secure) to use
* during the eTLD+1 probe. These should match the attributes that will be used
* when setting the actual cookie, so the probe accurately reflects whether a
* domain-scoped cookie can be set in the current context.
*/
export function getCookieDomain(
hostname = window.location.hostname,
cookieHandler = eTLDCookie,
cookieAttributes?: { sameSite?: string; secure?: boolean },
) {
// only compute it once per session to avoid unnecessary cookie ops
if (cachedETLDPlusOne) {
return cachedETLDPlusOne;
Expand All@@ -28,17 +40,22 @@ export function getCookieDomain(hostname = window.location.hostname, cookieHandl
// we know for sure that the first entry is definitely a TLD, skip it
for (let i = hostnameParts.length - 2; i >= 0; i--) {
const eTLD = hostnameParts.slice(i).join('.');
cookieHandler.set('1', { domain: eTLD });
cookieHandler.set('1', { ...cookieAttributes, domain: eTLD });

const res = cookieHandler.get();
if (res === '1') {
cookieHandler.remove({ domain: eTLD });
cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
cachedETLDPlusOne = eTLD;
return eTLD;
}

cookieHandler.remove({ domain: eTLD });
cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
}

return;
// Fallback to hostname to ensure domain-scoped cookie rather than host-only.
// In restricted contexts (e.g. cross-origin iframes), the set() will silently
// fail — which is preferable to creating a host-only cookie that conflicts
// with domain-scoped cookies set by non-iframe contexts.
cachedETLDPlusOne = hostname;
return hostname;
}
Loading
, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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fix(clerk-js): Backport iframe __client_uat cookie domain fix#7882

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to your account

 Merged

brkalow
merged 1 commit into

from

Feb 18, 2026
 Merged


fix(clerk-js): Backport iframe __client_uat cookie domain fix
#7882
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5 changes: 5 additions & 0 deletions
.changeset/fix-iframe-client-uat-cookie-domain.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,5 @@
---
'@clerk/clerk-js': patch
---

Fix `__client_uat` cookie being set on two different domain scopes when app is loaded in both iframe and non-iframe contexts. `getCookieDomain()` now falls back to `hostname` instead of `undefined` when the eTLD+1 probe fails, and the eTLD+1 probe uses the same `SameSite`/`Secure` attributes as the actual cookie to ensure consistent behavior across contexts.

17 changes: 15 additions & 2 deletions
packages/clerk-js/src/core/auth/__tests__/getCookieDomain.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -35,6 +35,19 @@ describe('getCookieDomain', () => {
 expect(result).toBe(hostname);
 });

 it('passes cookie attributes to the probe', () => {
 const hostname = 'app.example.com';
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValueOnce(undefined).mockReturnValueOnce('1'),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const attrs = { sameSite: 'None', secure: true };
 getCookieDomain(hostname, handler, attrs);
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'example.com' });
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'app.example.com' });
 });

 it('handles localhost', () => {
 const hostname = 'localhost';
 const result = getCookieDomain(hostname);
Expand All@@ -53,15 +66,15 @@ describe('getCookieDomain', () => {
 expect(getCookieDomain('bryce-local')).toBe('bryce-local');
 });

 it('returns undefined if the domain could not be determined', () => {
 it('falls back to hostname if the domain could not be determined', () => {
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValue(undefined),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const hostname = 'app.hello.co.uk';
 const result = getCookieDomain(hostname, handler);
 expect(result).toBeUndefined();
 expect(result).toBe(hostname);
 });

 it('uses cached value if there is one', () => {
Expand Down

2 changes: 1 addition & 1 deletion
packages/clerk-js/src/core/auth/cookies/clientUat.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -45,7 +45,7 @@ export const createClientUatCookie = (cookieSuffix: string): ClientUatCookieHand
 : 'Strict';
 const secure = getSecureAttribute(sameSite);
 const partitioned = __BUILD_VARIANT_CHIPS__ && secure;
 const domain = getCookieDomain();
 const domain = getCookieDomain(undefined, undefined, { sameSite, secure });

 // '0' indicates the user is signed out
 let val = '0';
Expand Down

27 changes: 22 additions & 5 deletions
packages/clerk-js/src/core/auth/getCookieDomain.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,19 @@ import { createCookieHandler } from '@clerk/shared/cookie';
let cachedETLDPlusOne: string;
const eTLDCookie = createCookieHandler('__clerk_test_etld');

export function getCookieDomain(hostname = window.location.hostname, cookieHandler = eTLDCookie) {
/**
 * @param hostname - The hostname to determine the eTLD+1 for.
 * @param cookieHandler - The cookie handler to use for the eTLD+1 probe.
 * @param cookieAttributes - Optional cookie attributes (sameSite, secure) to use
 * during the eTLD+1 probe. These should match the attributes that will be used
 * when setting the actual cookie, so the probe accurately reflects whether a
 * domain-scoped cookie can be set in the current context.
 */
export function getCookieDomain(
 hostname = window.location.hostname,
 cookieHandler = eTLDCookie,
 cookieAttributes?: { sameSite?: string; secure?: boolean },
) {
 // only compute it once per session to avoid unnecessary cookie ops
 if (cachedETLDPlusOne) {
 return cachedETLDPlusOne;
Expand All@@ -28,17 +40,22 @@ export function getCookieDomain(hostname = window.location.hostname, cookieHandl
 // we know for sure that the first entry is definitely a TLD, skip it
 for (let i = hostnameParts.length - 2; i >= 0; i--) {
 const eTLD = hostnameParts.slice(i).join('.');
 cookieHandler.set('1', { domain: eTLD });
 cookieHandler.set('1', { ...cookieAttributes, domain: eTLD });

 const res = cookieHandler.get();
 if (res === '1') {
 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 cachedETLDPlusOne = eTLD;
 return eTLD;
 }

 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 }

 return;
 // Fallback to hostname to ensure domain-scoped cookie rather than host-only.
 // In restricted contexts (e.g. cross-origin iframes), the set() will silently
 // fail — which is preferable to creating a host-only cookie that conflicts
 // with domain-scoped cookies set by non-iframe contexts.
 cachedETLDPlusOne = hostname;
 return hostname;
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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fix(clerk-js): Backport iframe __client_uat cookie domain fix#7882

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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privacy statement. We’ll occasionally send you account related emails.

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Sign in
to your account

 Merged

brkalow
merged 1 commit into

from

Feb 18, 2026
 Merged


fix(clerk-js): Backport iframe __client_uat cookie domain fix
#7882
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5 changes: 5 additions & 0 deletions
.changeset/fix-iframe-client-uat-cookie-domain.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,5 @@
---
'@clerk/clerk-js': patch
---

Fix `__client_uat` cookie being set on two different domain scopes when app is loaded in both iframe and non-iframe contexts. `getCookieDomain()` now falls back to `hostname` instead of `undefined` when the eTLD+1 probe fails, and the eTLD+1 probe uses the same `SameSite`/`Secure` attributes as the actual cookie to ensure consistent behavior across contexts.

17 changes: 15 additions & 2 deletions
packages/clerk-js/src/core/auth/__tests__/getCookieDomain.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -35,6 +35,19 @@ describe('getCookieDomain', () => {
 expect(result).toBe(hostname);
 });

 it('passes cookie attributes to the probe', () => {
 const hostname = 'app.example.com';
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValueOnce(undefined).mockReturnValueOnce('1'),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const attrs = { sameSite: 'None', secure: true };
 getCookieDomain(hostname, handler, attrs);
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'example.com' });
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'app.example.com' });
 });

 it('handles localhost', () => {
 const hostname = 'localhost';
 const result = getCookieDomain(hostname);
Expand All@@ -53,15 +66,15 @@ describe('getCookieDomain', () => {
 expect(getCookieDomain('bryce-local')).toBe('bryce-local');
 });

 it('returns undefined if the domain could not be determined', () => {
 it('falls back to hostname if the domain could not be determined', () => {
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValue(undefined),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const hostname = 'app.hello.co.uk';
 const result = getCookieDomain(hostname, handler);
 expect(result).toBeUndefined();
 expect(result).toBe(hostname);
 });

 it('uses cached value if there is one', () => {
Expand Down

2 changes: 1 addition & 1 deletion
packages/clerk-js/src/core/auth/cookies/clientUat.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -45,7 +45,7 @@ export const createClientUatCookie = (cookieSuffix: string): ClientUatCookieHand
 : 'Strict';
 const secure = getSecureAttribute(sameSite);
 const partitioned = __BUILD_VARIANT_CHIPS__ && secure;
 const domain = getCookieDomain();
 const domain = getCookieDomain(undefined, undefined, { sameSite, secure });

 // '0' indicates the user is signed out
 let val = '0';
Expand Down

27 changes: 22 additions & 5 deletions
packages/clerk-js/src/core/auth/getCookieDomain.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,19 @@ import { createCookieHandler } from '@clerk/shared/cookie';
let cachedETLDPlusOne: string;
const eTLDCookie = createCookieHandler('__clerk_test_etld');

export function getCookieDomain(hostname = window.location.hostname, cookieHandler = eTLDCookie) {
/**
 * @param hostname - The hostname to determine the eTLD+1 for.
 * @param cookieHandler - The cookie handler to use for the eTLD+1 probe.
 * @param cookieAttributes - Optional cookie attributes (sameSite, secure) to use
 * during the eTLD+1 probe. These should match the attributes that will be used
 * when setting the actual cookie, so the probe accurately reflects whether a
 * domain-scoped cookie can be set in the current context.
 */
export function getCookieDomain(
 hostname = window.location.hostname,
 cookieHandler = eTLDCookie,
 cookieAttributes?: { sameSite?: string; secure?: boolean },
) {
 // only compute it once per session to avoid unnecessary cookie ops
 if (cachedETLDPlusOne) {
 return cachedETLDPlusOne;
Expand All@@ -28,17 +40,22 @@ export function getCookieDomain(hostname = window.location.hostname, cookieHandl
 // we know for sure that the first entry is definitely a TLD, skip it
 for (let i = hostnameParts.length - 2; i >= 0; i--) {
 const eTLD = hostnameParts.slice(i).join('.');
 cookieHandler.set('1', { domain: eTLD });
 cookieHandler.set('1', { ...cookieAttributes, domain: eTLD });

 const res = cookieHandler.get();
 if (res === '1') {
 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 cachedETLDPlusOne = eTLD;
 return eTLD;
 }

 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 }

 return;
 // Fallback to hostname to ensure domain-scoped cookie rather than host-only.
 // In restricted contexts (e.g. cross-origin iframes), the set() will silently
 // fail — which is preferable to creating a host-only cookie that conflicts
 // with domain-scoped cookies set by non-iframe contexts.
 cachedETLDPlusOne = hostname;
 return hostname;
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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fix(clerk-js): Backport iframe __client_uat cookie domain fix#7882

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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privacy statement. We’ll occasionally send you account related emails.

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 Merged

brkalow
merged 1 commit into

from

Feb 18, 2026
 Merged


fix(clerk-js): Backport iframe __client_uat cookie domain fix
#7882
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5 changes: 5 additions & 0 deletions
.changeset/fix-iframe-client-uat-cookie-domain.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,5 @@
---
'@clerk/clerk-js': patch
---

Fix `__client_uat` cookie being set on two different domain scopes when app is loaded in both iframe and non-iframe contexts. `getCookieDomain()` now falls back to `hostname` instead of `undefined` when the eTLD+1 probe fails, and the eTLD+1 probe uses the same `SameSite`/`Secure` attributes as the actual cookie to ensure consistent behavior across contexts.

17 changes: 15 additions & 2 deletions
packages/clerk-js/src/core/auth/__tests__/getCookieDomain.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -35,6 +35,19 @@ describe('getCookieDomain', () => {
 expect(result).toBe(hostname);
 });

 it('passes cookie attributes to the probe', () => {
 const hostname = 'app.example.com';
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValueOnce(undefined).mockReturnValueOnce('1'),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const attrs = { sameSite: 'None', secure: true };
 getCookieDomain(hostname, handler, attrs);
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'example.com' });
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'app.example.com' });
 });

 it('handles localhost', () => {
 const hostname = 'localhost';
 const result = getCookieDomain(hostname);
Expand All@@ -53,15 +66,15 @@ describe('getCookieDomain', () => {
 expect(getCookieDomain('bryce-local')).toBe('bryce-local');
 });

 it('returns undefined if the domain could not be determined', () => {
 it('falls back to hostname if the domain could not be determined', () => {
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValue(undefined),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const hostname = 'app.hello.co.uk';
 const result = getCookieDomain(hostname, handler);
 expect(result).toBeUndefined();
 expect(result).toBe(hostname);
 });

 it('uses cached value if there is one', () => {
Expand Down

2 changes: 1 addition & 1 deletion
packages/clerk-js/src/core/auth/cookies/clientUat.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -45,7 +45,7 @@ export const createClientUatCookie = (cookieSuffix: string): ClientUatCookieHand
 : 'Strict';
 const secure = getSecureAttribute(sameSite);
 const partitioned = __BUILD_VARIANT_CHIPS__ && secure;
 const domain = getCookieDomain();
 const domain = getCookieDomain(undefined, undefined, { sameSite, secure });

 // '0' indicates the user is signed out
 let val = '0';
Expand Down

27 changes: 22 additions & 5 deletions
packages/clerk-js/src/core/auth/getCookieDomain.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,19 @@ import { createCookieHandler } from '@clerk/shared/cookie';
let cachedETLDPlusOne: string;
const eTLDCookie = createCookieHandler('__clerk_test_etld');

export function getCookieDomain(hostname = window.location.hostname, cookieHandler = eTLDCookie) {
/**
 * @param hostname - The hostname to determine the eTLD+1 for.
 * @param cookieHandler - The cookie handler to use for the eTLD+1 probe.
 * @param cookieAttributes - Optional cookie attributes (sameSite, secure) to use
 * during the eTLD+1 probe. These should match the attributes that will be used
 * when setting the actual cookie, so the probe accurately reflects whether a
 * domain-scoped cookie can be set in the current context.
 */
export function getCookieDomain(
 hostname = window.location.hostname,
 cookieHandler = eTLDCookie,
 cookieAttributes?: { sameSite?: string; secure?: boolean },
) {
 // only compute it once per session to avoid unnecessary cookie ops
 if (cachedETLDPlusOne) {
 return cachedETLDPlusOne;
Expand All@@ -28,17 +40,22 @@ export function getCookieDomain(hostname = window.location.hostname, cookieHandl
 // we know for sure that the first entry is definitely a TLD, skip it
 for (let i = hostnameParts.length - 2; i >= 0; i--) {
 const eTLD = hostnameParts.slice(i).join('.');
 cookieHandler.set('1', { domain: eTLD });
 cookieHandler.set('1', { ...cookieAttributes, domain: eTLD });

 const res = cookieHandler.get();
 if (res === '1') {
 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 cachedETLDPlusOne = eTLD;
 return eTLD;
 }

 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 }

 return;
 // Fallback to hostname to ensure domain-scoped cookie rather than host-only.
 // In restricted contexts (e.g. cross-origin iframes), the set() will silently
 // fail — which is preferable to creating a host-only cookie that conflicts
 // with domain-scoped cookies set by non-iframe contexts.
 cachedETLDPlusOne = hostname;
 return hostname;
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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fix(clerk-js): Backport iframe __client_uat cookie domain fix#7882

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 Merged

brkalow
merged 1 commit into

from

Feb 18, 2026
 Merged


fix(clerk-js): Backport iframe __client_uat cookie domain fix
#7882
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5 changes: 5 additions & 0 deletions
.changeset/fix-iframe-client-uat-cookie-domain.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,5 @@
---
'@clerk/clerk-js': patch
---

Fix `__client_uat` cookie being set on two different domain scopes when app is loaded in both iframe and non-iframe contexts. `getCookieDomain()` now falls back to `hostname` instead of `undefined` when the eTLD+1 probe fails, and the eTLD+1 probe uses the same `SameSite`/`Secure` attributes as the actual cookie to ensure consistent behavior across contexts.

17 changes: 15 additions & 2 deletions
packages/clerk-js/src/core/auth/__tests__/getCookieDomain.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -35,6 +35,19 @@ describe('getCookieDomain', () => {
 expect(result).toBe(hostname);
 });

 it('passes cookie attributes to the probe', () => {
 const hostname = 'app.example.com';
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValueOnce(undefined).mockReturnValueOnce('1'),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const attrs = { sameSite: 'None', secure: true };
 getCookieDomain(hostname, handler, attrs);
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'example.com' });
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'app.example.com' });
 });

 it('handles localhost', () => {
 const hostname = 'localhost';
 const result = getCookieDomain(hostname);
Expand All@@ -53,15 +66,15 @@ describe('getCookieDomain', () => {
 expect(getCookieDomain('bryce-local')).toBe('bryce-local');
 });

 it('returns undefined if the domain could not be determined', () => {
 it('falls back to hostname if the domain could not be determined', () => {
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValue(undefined),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const hostname = 'app.hello.co.uk';
 const result = getCookieDomain(hostname, handler);
 expect(result).toBeUndefined();
 expect(result).toBe(hostname);
 });

 it('uses cached value if there is one', () => {
Expand Down

2 changes: 1 addition & 1 deletion
packages/clerk-js/src/core/auth/cookies/clientUat.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -45,7 +45,7 @@ export const createClientUatCookie = (cookieSuffix: string): ClientUatCookieHand
 : 'Strict';
 const secure = getSecureAttribute(sameSite);
 const partitioned = __BUILD_VARIANT_CHIPS__ && secure;
 const domain = getCookieDomain();
 const domain = getCookieDomain(undefined, undefined, { sameSite, secure });

 // '0' indicates the user is signed out
 let val = '0';
Expand Down

27 changes: 22 additions & 5 deletions
packages/clerk-js/src/core/auth/getCookieDomain.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,19 @@ import { createCookieHandler } from '@clerk/shared/cookie';
let cachedETLDPlusOne: string;
const eTLDCookie = createCookieHandler('__clerk_test_etld');

export function getCookieDomain(hostname = window.location.hostname, cookieHandler = eTLDCookie) {
/**
 * @param hostname - The hostname to determine the eTLD+1 for.
 * @param cookieHandler - The cookie handler to use for the eTLD+1 probe.
 * @param cookieAttributes - Optional cookie attributes (sameSite, secure) to use
 * during the eTLD+1 probe. These should match the attributes that will be used
 * when setting the actual cookie, so the probe accurately reflects whether a
 * domain-scoped cookie can be set in the current context.
 */
export function getCookieDomain(
 hostname = window.location.hostname,
 cookieHandler = eTLDCookie,
 cookieAttributes?: { sameSite?: string; secure?: boolean },
) {
 // only compute it once per session to avoid unnecessary cookie ops
 if (cachedETLDPlusOne) {
 return cachedETLDPlusOne;
Expand All@@ -28,17 +40,22 @@ export function getCookieDomain(hostname = window.location.hostname, cookieHandl
 // we know for sure that the first entry is definitely a TLD, skip it
 for (let i = hostnameParts.length - 2; i >= 0; i--) {
 const eTLD = hostnameParts.slice(i).join('.');
 cookieHandler.set('1', { domain: eTLD });
 cookieHandler.set('1', { ...cookieAttributes, domain: eTLD });

 const res = cookieHandler.get();
 if (res === '1') {
 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 cachedETLDPlusOne = eTLD;
 return eTLD;
 }

 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 }

 return;
 // Fallback to hostname to ensure domain-scoped cookie rather than host-only.
 // In restricted contexts (e.g. cross-origin iframes), the set() will silently
 // fail — which is preferable to creating a host-only cookie that conflicts
 // with domain-scoped cookies set by non-iframe contexts.
 cachedETLDPlusOne = hostname;
 return hostname;
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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fix(clerk-js): Backport iframe __client_uat cookie domain fix#7882

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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privacy statement. We’ll occasionally send you account related emails.

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Sign in
to your account

 Merged

brkalow
merged 1 commit into

from

Feb 18, 2026
 Merged


fix(clerk-js): Backport iframe __client_uat cookie domain fix
#7882
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5 changes: 5 additions & 0 deletions
.changeset/fix-iframe-client-uat-cookie-domain.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,5 @@
---
'@clerk/clerk-js': patch
---

Fix `__client_uat` cookie being set on two different domain scopes when app is loaded in both iframe and non-iframe contexts. `getCookieDomain()` now falls back to `hostname` instead of `undefined` when the eTLD+1 probe fails, and the eTLD+1 probe uses the same `SameSite`/`Secure` attributes as the actual cookie to ensure consistent behavior across contexts.

17 changes: 15 additions & 2 deletions
packages/clerk-js/src/core/auth/__tests__/getCookieDomain.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -35,6 +35,19 @@ describe('getCookieDomain', () => {
 expect(result).toBe(hostname);
 });

 it('passes cookie attributes to the probe', () => {
 const hostname = 'app.example.com';
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValueOnce(undefined).mockReturnValueOnce('1'),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const attrs = { sameSite: 'None', secure: true };
 getCookieDomain(hostname, handler, attrs);
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'example.com' });
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'app.example.com' });
 });

 it('handles localhost', () => {
 const hostname = 'localhost';
 const result = getCookieDomain(hostname);
Expand All@@ -53,15 +66,15 @@ describe('getCookieDomain', () => {
 expect(getCookieDomain('bryce-local')).toBe('bryce-local');
 });

 it('returns undefined if the domain could not be determined', () => {
 it('falls back to hostname if the domain could not be determined', () => {
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValue(undefined),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const hostname = 'app.hello.co.uk';
 const result = getCookieDomain(hostname, handler);
 expect(result).toBeUndefined();
 expect(result).toBe(hostname);
 });

 it('uses cached value if there is one', () => {
Expand Down

2 changes: 1 addition & 1 deletion
packages/clerk-js/src/core/auth/cookies/clientUat.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -45,7 +45,7 @@ export const createClientUatCookie = (cookieSuffix: string): ClientUatCookieHand
 : 'Strict';
 const secure = getSecureAttribute(sameSite);
 const partitioned = __BUILD_VARIANT_CHIPS__ && secure;
 const domain = getCookieDomain();
 const domain = getCookieDomain(undefined, undefined, { sameSite, secure });

 // '0' indicates the user is signed out
 let val = '0';
Expand Down

27 changes: 22 additions & 5 deletions
packages/clerk-js/src/core/auth/getCookieDomain.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,19 @@ import { createCookieHandler } from '@clerk/shared/cookie';
let cachedETLDPlusOne: string;
const eTLDCookie = createCookieHandler('__clerk_test_etld');

export function getCookieDomain(hostname = window.location.hostname, cookieHandler = eTLDCookie) {
/**
 * @param hostname - The hostname to determine the eTLD+1 for.
 * @param cookieHandler - The cookie handler to use for the eTLD+1 probe.
 * @param cookieAttributes - Optional cookie attributes (sameSite, secure) to use
 * during the eTLD+1 probe. These should match the attributes that will be used
 * when setting the actual cookie, so the probe accurately reflects whether a
 * domain-scoped cookie can be set in the current context.
 */
export function getCookieDomain(
 hostname = window.location.hostname,
 cookieHandler = eTLDCookie,
 cookieAttributes?: { sameSite?: string; secure?: boolean },
) {
 // only compute it once per session to avoid unnecessary cookie ops
 if (cachedETLDPlusOne) {
 return cachedETLDPlusOne;
Expand All@@ -28,17 +40,22 @@ export function getCookieDomain(hostname = window.location.hostname, cookieHandl
 // we know for sure that the first entry is definitely a TLD, skip it
 for (let i = hostnameParts.length - 2; i >= 0; i--) {
 const eTLD = hostnameParts.slice(i).join('.');
 cookieHandler.set('1', { domain: eTLD });
 cookieHandler.set('1', { ...cookieAttributes, domain: eTLD });

 const res = cookieHandler.get();
 if (res === '1') {
 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 cachedETLDPlusOne = eTLD;
 return eTLD;
 }

 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 }

 return;
 // Fallback to hostname to ensure domain-scoped cookie rather than host-only.
 // In restricted contexts (e.g. cross-origin iframes), the set() will silently
 // fail — which is preferable to creating a host-only cookie that conflicts
 // with domain-scoped cookies set by non-iframe contexts.
 cachedETLDPlusOne = hostname;
 return hostname;
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
fix(clerk-js): Backport iframe __client_uat cookie domain fix#7882

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Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

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By clicking “Sign up for GitHub”, you agree to our terms of service and
privacy statement. We’ll occasionally send you account related emails.

Already on GitHub?
Sign in
to your account

 Merged

brkalow
merged 1 commit into

from

Feb 18, 2026
 Merged


fix(clerk-js): Backport iframe __client_uat cookie domain fix
#7882
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5 changes: 5 additions & 0 deletions
.changeset/fix-iframe-client-uat-cookie-domain.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
@@ -0,0 +1,5 @@
---
'@clerk/clerk-js': patch
---

Fix `__client_uat` cookie being set on two different domain scopes when app is loaded in both iframe and non-iframe contexts. `getCookieDomain()` now falls back to `hostname` instead of `undefined` when the eTLD+1 probe fails, and the eTLD+1 probe uses the same `SameSite`/`Secure` attributes as the actual cookie to ensure consistent behavior across contexts.

17 changes: 15 additions & 2 deletions
packages/clerk-js/src/core/auth/__tests__/getCookieDomain.test.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -35,6 +35,19 @@ describe('getCookieDomain', () => {
 expect(result).toBe(hostname);
 });

 it('passes cookie attributes to the probe', () => {
 const hostname = 'app.example.com';
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValueOnce(undefined).mockReturnValueOnce('1'),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const attrs = { sameSite: 'None', secure: true };
 getCookieDomain(hostname, handler, attrs);
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'example.com' });
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'app.example.com' });
 });

 it('handles localhost', () => {
 const hostname = 'localhost';
 const result = getCookieDomain(hostname);
Expand All@@ -53,15 +66,15 @@ describe('getCookieDomain', () => {
 expect(getCookieDomain('bryce-local')).toBe('bryce-local');
 });

 it('returns undefined if the domain could not be determined', () => {
 it('falls back to hostname if the domain could not be determined', () => {
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValue(undefined),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const hostname = 'app.hello.co.uk';
 const result = getCookieDomain(hostname, handler);
 expect(result).toBeUndefined();
 expect(result).toBe(hostname);
 });

 it('uses cached value if there is one', () => {
Expand Down

2 changes: 1 addition & 1 deletion
packages/clerk-js/src/core/auth/cookies/clientUat.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -45,7 +45,7 @@ export const createClientUatCookie = (cookieSuffix: string): ClientUatCookieHand
 : 'Strict';
 const secure = getSecureAttribute(sameSite);
 const partitioned = __BUILD_VARIANT_CHIPS__ && secure;
 const domain = getCookieDomain();
 const domain = getCookieDomain(undefined, undefined, { sameSite, secure });

 // '0' indicates the user is signed out
 let val = '0';
Expand Down

27 changes: 22 additions & 5 deletions
packages/clerk-js/src/core/auth/getCookieDomain.ts

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,19 @@ import { createCookieHandler } from '@clerk/shared/cookie';
let cachedETLDPlusOne: string;
const eTLDCookie = createCookieHandler('__clerk_test_etld');

export function getCookieDomain(hostname = window.location.hostname, cookieHandler = eTLDCookie) {
/**
 * @param hostname - The hostname to determine the eTLD+1 for.
 * @param cookieHandler - The cookie handler to use for the eTLD+1 probe.
 * @param cookieAttributes - Optional cookie attributes (sameSite, secure) to use
 * during the eTLD+1 probe. These should match the attributes that will be used
 * when setting the actual cookie, so the probe accurately reflects whether a
 * domain-scoped cookie can be set in the current context.
 */
export function getCookieDomain(
 hostname = window.location.hostname,
 cookieHandler = eTLDCookie,
 cookieAttributes?: { sameSite?: string; secure?: boolean },
) {
 // only compute it once per session to avoid unnecessary cookie ops
 if (cachedETLDPlusOne) {
 return cachedETLDPlusOne;
Expand All@@ -28,17 +40,22 @@ export function getCookieDomain(hostname = window.location.hostname, cookieHandl
 // we know for sure that the first entry is definitely a TLD, skip it
 for (let i = hostnameParts.length - 2; i >= 0; i--) {
 const eTLD = hostnameParts.slice(i).join('.');
 cookieHandler.set('1', { domain: eTLD });
 cookieHandler.set('1', { ...cookieAttributes, domain: eTLD });

 const res = cookieHandler.get();
 if (res === '1') {
 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 cachedETLDPlusOne = eTLD;
 return eTLD;
 }

 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 }

 return;
 // Fallback to hostname to ensure domain-scoped cookie rather than host-only.
 // In restricted contexts (e.g. cross-origin iframes), the set() will silently
 // fail — which is preferable to creating a host-only cookie that conflicts
 // with domain-scoped cookies set by non-iframe contexts.
 cachedETLDPlusOne = hostname;
 return hostname;
}
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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fix(clerk-js): Backport iframe __client_uat cookie domain fix#7882

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 Merged

brkalow
merged 1 commit into

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Feb 18, 2026
 Merged


fix(clerk-js): Backport iframe __client_uat cookie domain fix
#7882
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5 changes: 5 additions & 0 deletions
.changeset/fix-iframe-client-uat-cookie-domain.md

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,5 @@
---
'@clerk/clerk-js': patch
---

Fix `__client_uat` cookie being set on two different domain scopes when app is loaded in both iframe and non-iframe contexts. `getCookieDomain()` now falls back to `hostname` instead of `undefined` when the eTLD+1 probe fails, and the eTLD+1 probe uses the same `SameSite`/`Secure` attributes as the actual cookie to ensure consistent behavior across contexts.

17 changes: 15 additions & 2 deletions
packages/clerk-js/src/core/auth/__tests__/getCookieDomain.test.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -35,6 +35,19 @@ describe('getCookieDomain', () => {
 expect(result).toBe(hostname);
 });

 it('passes cookie attributes to the probe', () => {
 const hostname = 'app.example.com';
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValueOnce(undefined).mockReturnValueOnce('1'),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const attrs = { sameSite: 'None', secure: true };
 getCookieDomain(hostname, handler, attrs);
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'example.com' });
 expect(handler.set).toHaveBeenCalledWith('1', { sameSite: 'None', secure: true, domain: 'app.example.com' });
 });

 it('handles localhost', () => {
 const hostname = 'localhost';
 const result = getCookieDomain(hostname);
Expand All@@ -53,15 +66,15 @@ describe('getCookieDomain', () => {
 expect(getCookieDomain('bryce-local')).toBe('bryce-local');
 });

 it('returns undefined if the domain could not be determined', () => {
 it('falls back to hostname if the domain could not be determined', () => {
 const handler: CookieHandler = {
 get: vi.fn().mockReturnValue(undefined),
 set: vi.fn().mockReturnValue(undefined),
 remove: vi.fn().mockReturnValue(undefined),
 };
 const hostname = 'app.hello.co.uk';
 const result = getCookieDomain(hostname, handler);
 expect(result).toBeUndefined();
 expect(result).toBe(hostname);
 });

 it('uses cached value if there is one', () => {
Expand Down

2 changes: 1 addition & 1 deletion
packages/clerk-js/src/core/auth/cookies/clientUat.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -45,7 +45,7 @@ export const createClientUatCookie = (cookieSuffix: string): ClientUatCookieHand
 : 'Strict';
 const secure = getSecureAttribute(sameSite);
 const partitioned = __BUILD_VARIANT_CHIPS__ && secure;
 const domain = getCookieDomain();
 const domain = getCookieDomain(undefined, undefined, { sameSite, secure });

 // '0' indicates the user is signed out
 let val = '0';
Expand Down

27 changes: 22 additions & 5 deletions
packages/clerk-js/src/core/auth/getCookieDomain.ts

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Original file line numberDiff line numberDiff line change
Expand Up@@ -8,7 +8,19 @@ import { createCookieHandler } from '@clerk/shared/cookie';
let cachedETLDPlusOne: string;
const eTLDCookie = createCookieHandler('__clerk_test_etld');

export function getCookieDomain(hostname = window.location.hostname, cookieHandler = eTLDCookie) {
/**
 * @param hostname - The hostname to determine the eTLD+1 for.
 * @param cookieHandler - The cookie handler to use for the eTLD+1 probe.
 * @param cookieAttributes - Optional cookie attributes (sameSite, secure) to use
 * during the eTLD+1 probe. These should match the attributes that will be used
 * when setting the actual cookie, so the probe accurately reflects whether a
 * domain-scoped cookie can be set in the current context.
 */
export function getCookieDomain(
 hostname = window.location.hostname,
 cookieHandler = eTLDCookie,
 cookieAttributes?: { sameSite?: string; secure?: boolean },
) {
 // only compute it once per session to avoid unnecessary cookie ops
 if (cachedETLDPlusOne) {
 return cachedETLDPlusOne;
Expand All@@ -28,17 +40,22 @@ export function getCookieDomain(hostname = window.location.hostname, cookieHandl
 // we know for sure that the first entry is definitely a TLD, skip it
 for (let i = hostnameParts.length - 2; i >= 0; i--) {
 const eTLD = hostnameParts.slice(i).join('.');
 cookieHandler.set('1', { domain: eTLD });
 cookieHandler.set('1', { ...cookieAttributes, domain: eTLD });

 const res = cookieHandler.get();
 if (res === '1') {
 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 cachedETLDPlusOne = eTLD;
 return eTLD;
 }

 cookieHandler.remove({ domain: eTLD });
 cookieHandler.remove({ ...cookieAttributes, domain: eTLD });
 }

 return;
 // Fallback to hostname to ensure domain-scoped cookie rather than host-only.
 // In restricted contexts (e.g. cross-origin iframes), the set() will silently
 // fail — which is preferable to creating a host-only cookie that conflicts
 // with domain-scoped cookies set by non-iframe contexts.
 cachedETLDPlusOne = hostname;
 return hostname;
}
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