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[release/9.0-staging] Deny unmasked frame receive for WebSocket Server - #123661

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[release/9.0-staging] Deny unmasked frame receive for WebSocket Server#123661
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Backport of #123485 to release/9.0-staging

/cc @liveans

Increasing RFC compliance for WebSocket

Customer Impact

RFC compliance

Regression

No

Testing

Manual verification + automated tests

Risk

Low, the change only affects non‑compliant WebSocket clients sending unmasked frames, which is explicitly disallowed by RFC 6455. No behavior change is expected for compliant clients.

Ahmet İbrahim Aksoyand others added 2 commits January 27, 2026 10:01
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@wfurt
wfurt merged commit 309aa7f into release/9.0-stagingMar 13, 2026
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@wfurt
wfurt deleted the backport/pr-123485-to-release/9.0-staging branch March 13, 2026 00:30
wfurt pushed a commit to jozkee/runtime that referenced this pull request Mar 13, 2026
@github-actionsAhmet İbrahim Aksoy
@wfurt
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server (
4a0bd27
dotnet#123661)
Backport of dotnet#123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
## Customer Impact
RFC compliance
## Regression
No
## Testing
Manual verification + automated tests
## Risk
Low, the change only affects non‑compliant WebSocket clients sending
unmasked frames, which is explicitly disallowed by RFC 6455. No behavior
change is expected for compliant clients.
---------
Co-authored-by: Ahmet İbrahim Aksoy <aaksoy@microsoft.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@rbhandarbhanda modified the milestones: 9.0.x, 9.0.15Mar 30, 2026
@github-actionsgithub-actionsBot locked and limited conversation to collaborators Apr 30, 2026
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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
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;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
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} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
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var __m = "github.com";
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[release/9.0-staging] Deny unmasked frame receive for WebSocket Server by github-actions[bot] · Pull Request #123661 · dotnet/runtime · GitHub
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[release/9.0-staging] Deny unmasked frame receive for WebSocket Server - #123661
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Mar 13, 2026
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[release/9.0-staging] Deny unmasked frame receive for WebSocket Server#123661
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Backport of #123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
Customer Impact
RFC compliance
Regression
No
Testing
Manual verification + automated tests
Risk
Low, the change only affects non‑compliant WebSocket clients sending unmasked frames, which is explicitly disallowed by RFC 6455. No behavior change is expected for compliant clients.
Ahmet İbrahim Aksoyand others
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January 27, 2026 10:01
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wfurt pushed a commit
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@github-actionsAhmet İbrahim Aksoy
@wfurt
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server (
4a0bd27
dotnet#123661)
Backport of dotnet#123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
## Customer Impact
RFC compliance
## Regression
No
## Testing
Manual verification + automated tests
## Risk
Low, the change only affects non‑compliant WebSocket clients sending
unmasked frames, which is explicitly disallowed by RFC 6455. No behavior
change is expected for compliant clients.
---------
Co-authored-by: Ahmet İbrahim Aksoy <aaksoy@microsoft.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@rbhandarbhanda
modified the milestones:
9.0.x, 9.0.15Mar 30, 2026
@github-actionsgithub-actionsBot
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
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color-scheme: dark light;
}
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';
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server by github-actions[bot] · Pull Request #123661 · dotnet/runtime · GitHub
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[release/9.0-staging] Deny unmasked frame receive for WebSocket Server - #123661
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Mar 13, 2026
Merged
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server#123661
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Backport of #123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
Customer Impact
RFC compliance
Regression
No
Testing
Manual verification + automated tests
Risk
Low, the change only affects non‑compliant WebSocket clients sending unmasked frames, which is explicitly disallowed by RFC 6455. No behavior change is expected for compliant clients.
Ahmet İbrahim Aksoyand others
added 2 commits
January 27, 2026 10:01
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merged commit 309aa7f
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deleted the

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March 13, 2026 00:30
wfurt pushed a commit
to jozkee/runtime
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Mar 13, 2026
@github-actionsAhmet İbrahim Aksoy
@wfurt
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server (
4a0bd27
dotnet#123661)
Backport of dotnet#123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
## Customer Impact
RFC compliance
## Regression
No
## Testing
Manual verification + automated tests
## Risk
Low, the change only affects non‑compliant WebSocket clients sending
unmasked frames, which is explicitly disallowed by RFC 6455. No behavior
change is expected for compliant clients.
---------
Co-authored-by: Ahmet İbrahim Aksoy <aaksoy@microsoft.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@rbhandarbhanda
modified the milestones:
9.0.x, 9.0.15Mar 30, 2026
@github-actionsgithub-actionsBot
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
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terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
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var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
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Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
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mutations.forEach(function(m) {
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if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
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observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server by github-actions[bot] · Pull Request #123661 · dotnet/runtime · GitHub
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[release/9.0-staging] Deny unmasked frame receive for WebSocket Server - #123661
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Mar 13, 2026
Merged
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server#123661
wfurt merged 3 commits into
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edited by karelz

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Backport of #123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
Customer Impact
RFC compliance
Regression
No
Testing
Manual verification + automated tests
Risk
Low, the change only affects non‑compliant WebSocket clients sending unmasked frames, which is explicitly disallowed by RFC 6455. No behavior change is expected for compliant clients.
Ahmet İbrahim Aksoyand others
added 2 commits
January 27, 2026 10:01
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merged commit 309aa7f
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77 of 82 checks passed

@wfurt
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deleted the

backport/pr-123485-to-release/9.0-staging

branch
March 13, 2026 00:30
wfurt pushed a commit
to jozkee/runtime
that referenced
this pull request
Mar 13, 2026
@github-actionsAhmet İbrahim Aksoy
@wfurt
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server (
4a0bd27
dotnet#123661)
Backport of dotnet#123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
## Customer Impact
RFC compliance
## Regression
No
## Testing
Manual verification + automated tests
## Risk
Low, the change only affects non‑compliant WebSocket clients sending
unmasked frames, which is explicitly disallowed by RFC 6455. No behavior
change is expected for compliant clients.
---------
Co-authored-by: Ahmet İbrahim Aksoy <aaksoy@microsoft.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@rbhandarbhanda
modified the milestones:
9.0.x, 9.0.15Mar 30, 2026
@github-actionsgithub-actionsBot
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server by github-actions[bot] · Pull Request #123661 · dotnet/runtime · GitHub
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[release/9.0-staging] Deny unmasked frame receive for WebSocket Server - #123661
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[release/9.0-staging] Deny unmasked frame receive for WebSocket Server#123661
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Backport of #123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
Customer Impact
RFC compliance
Regression
No
Testing
Manual verification + automated tests
Risk
Low, the change only affects non‑compliant WebSocket clients sending unmasked frames, which is explicitly disallowed by RFC 6455. No behavior change is expected for compliant clients.
Ahmet İbrahim Aksoyand others
added 2 commits
January 27, 2026 10:01
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deleted the

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March 13, 2026 00:30
wfurt pushed a commit
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Mar 13, 2026
@github-actionsAhmet İbrahim Aksoy
@wfurt
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server (
4a0bd27
dotnet#123661)
Backport of dotnet#123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
## Customer Impact
RFC compliance
## Regression
No
## Testing
Manual verification + automated tests
## Risk
Low, the change only affects non‑compliant WebSocket clients sending
unmasked frames, which is explicitly disallowed by RFC 6455. No behavior
change is expected for compliant clients.
---------
Co-authored-by: Ahmet İbrahim Aksoy <aaksoy@microsoft.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@rbhandarbhanda
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server by github-actions[bot] · Pull Request #123661 · dotnet/runtime · GitHub
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[release/9.0-staging] Deny unmasked frame receive for WebSocket Server - #123661
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Mar 13, 2026
Merged
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server#123661
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Backport of #123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
Customer Impact
RFC compliance
Regression
No
Testing
Manual verification + automated tests
Risk
Low, the change only affects non‑compliant WebSocket clients sending unmasked frames, which is explicitly disallowed by RFC 6455. No behavior change is expected for compliant clients.
Ahmet İbrahim Aksoyand others
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January 27, 2026 10:01
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wfurt pushed a commit
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@github-actionsAhmet İbrahim Aksoy
@wfurt
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server (
4a0bd27
dotnet#123661)
Backport of dotnet#123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
## Customer Impact
RFC compliance
## Regression
No
## Testing
Manual verification + automated tests
## Risk
Low, the change only affects non‑compliant WebSocket clients sending
unmasked frames, which is explicitly disallowed by RFC 6455. No behavior
change is expected for compliant clients.
---------
Co-authored-by: Ahmet İbrahim Aksoy <aaksoy@microsoft.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@rbhandarbhanda
modified the milestones:
9.0.x, 9.0.15Mar 30, 2026
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server by github-actions[bot] · Pull Request #123661 · dotnet/runtime · GitHub
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[release/9.0-staging] Deny unmasked frame receive for WebSocket Server - #123661
Merged
wfurt merged 3 commits into
release/9.0-stagingfrom 
backport/pr-123485-to-release/9.0-staging
Mar 13, 2026
Merged
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server#123661
wfurt merged 3 commits into
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backport/pr-123485-to-release/9.0-staging
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Jan 27, 2026•

edited by karelz

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Backport of #123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
Customer Impact
RFC compliance
Regression
No
Testing
Manual verification + automated tests
Risk
Low, the change only affects non‑compliant WebSocket clients sending unmasked frames, which is explicitly disallowed by RFC 6455. No behavior change is expected for compliant clients.
Ahmet İbrahim Aksoyand others
added 2 commits
January 27, 2026 10:01
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merged commit 309aa7f
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deleted the

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March 13, 2026 00:30
wfurt pushed a commit
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Mar 13, 2026
@github-actionsAhmet İbrahim Aksoy
@wfurt
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server (
4a0bd27
dotnet#123661)
Backport of dotnet#123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
## Customer Impact
RFC compliance
## Regression
No
## Testing
Manual verification + automated tests
## Risk
Low, the change only affects non‑compliant WebSocket clients sending
unmasked frames, which is explicitly disallowed by RFC 6455. No behavior
change is expected for compliant clients.
---------
Co-authored-by: Ahmet İbrahim Aksoy <aaksoy@microsoft.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@rbhandarbhanda
modified the milestones:
9.0.x, 9.0.15Mar 30, 2026
@github-actionsgithub-actionsBot
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server by github-actions[bot] · Pull Request #123661 · dotnet/runtime · GitHub
Skip to content
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server - #123661
Merged
wfurt merged 3 commits into
release/9.0-stagingfrom 
backport/pr-123485-to-release/9.0-staging
Mar 13, 2026
Merged
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server#123661
wfurt merged 3 commits into
release/9.0-stagingfrom 
backport/pr-123485-to-release/9.0-staging
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Jan 27, 2026•

edited by karelz

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Backport of #123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
Customer Impact
RFC compliance
Regression
No
Testing
Manual verification + automated tests
Risk
Low, the change only affects non‑compliant WebSocket clients sending unmasked frames, which is explicitly disallowed by RFC 6455. No behavior change is expected for compliant clients.
Ahmet İbrahim Aksoyand others
added 2 commits
January 27, 2026 10:01
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deleted the

backport/pr-123485-to-release/9.0-staging

branch
March 13, 2026 00:30
wfurt pushed a commit
to jozkee/runtime
that referenced
this pull request
Mar 13, 2026
@github-actionsAhmet İbrahim Aksoy
@wfurt
[release/9.0-staging] Deny unmasked frame receive for WebSocket Server (
4a0bd27
dotnet#123661)
Backport of dotnet#123485 to release/9.0-staging
/cc @liveans
Increasing RFC compliance for WebSocket
## Customer Impact
RFC compliance
## Regression
No
## Testing
Manual verification + automated tests
## Risk
Low, the change only affects non‑compliant WebSocket clients sending
unmasked frames, which is explicitly disallowed by RFC 6455. No behavior
change is expected for compliant clients.
---------
Co-authored-by: Ahmet İbrahim Aksoy <aaksoy@microsoft.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@rbhandarbhanda
modified the milestones:
9.0.x, 9.0.15Mar 30, 2026
@github-actionsgithub-actionsBot
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