Security: nextcloud/nextcloud-filelink

Security

SECURITY.md

Security Policy

💡 TLDR: Report security issues at hackerone.com/nextcloud

Found a security bug in Nextcloud? Let's get it fixed!

If you believe you have found an issue that meets our definition of a security vulnerability, we encourage you to let us know right away. Please use the reporting process described below.

If you are a...See section...
Security ResearcherHow to Report a Vulnerability
Nextcloud Admin or UserSecurity Advisories, Supported Versions

How to Report a Vulnerability

⚠️ Do not report security vulnerabilities through public GitHub issues.

Instead, please:

Your report should include:

  • Product version
  • A clear description of the vulnerability
  • Steps to reproduce the issue (clear, step-by-step instructions are greatly appreciated)
  • Any other details that may assist our investigation

If you require encrypted communication, please request it in your initial message.

Note: This process is for confidential reporting of software vulnerabilities only. For general support or configuration help, see Nextcloud Support.

What to Expect After Reporting

In most cases, you should receive an initial response within 24 hours.

A member of our security team will:

  • Confirm the vulnerability
  • Assess its impact
  • Follow up with any questions
  • Coordinate the fix and public disclosure

We apply, test, and release fixes for all relevant, supported stable branches in the next security update. Vulnerabilities are publicly announced after the fix is released. As a thank you, we will add your name to our Hall of Fame.

If your report concerns an app not maintained by Nextcloud (e.g., community-maintained apps hosted by Nextcloud or hosted elsewhere), our security team will coordinate with the current maintainer to help resolve the issue in a similar fashion.

Bug Bounties

If you are interested in a bug bounty, please note that complete, detailed reports can contribute to higher bounty awards. Details on past bounties are available at HackerOne.

Security Advisories

Published advisories for Nextcloud Server, Clients, and Apps are available at the Nextcloud Security Advisories page.

Supported Versions

Each major release of Nextcloud Server receives security updates for one year from its initial release date. The Nextcloud project typically supports at least the two most recent major releases.

To stay protected:

  • Ensure your Nextcloud Server is always running a supported major release
  • Promptly apply all maintenance releases (these include critical security and functionality bug fixes)
  • Monitor the end-of-life (EOL) date for your major release (after this date, no further maintenance releases will be published. Upgrading to a newer major release is strongly recommended.)

See the Maintenance and Release Schedule for details.

Additional Information

There aren't any published security advisories

, '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" + '

Skip to content
Security: nextcloud/nextcloud-filelink
Security

SECURITY.md

Security Policy
💡 TLDR: Report security issues at hackerone.com/nextcloud
Found a security bug in Nextcloud? Let's get it fixed!
If you believe you have found an issue that meets our
definition of a security vulnerability,
we encourage you to let us know right away. Please use the reporting process described below.
If you are a...See section...
Security ResearcherHow to Report a Vulnerability
Nextcloud Admin or UserSecurity Advisories, Supported Versions
How to Report a Vulnerability
⚠️ Do not report security vulnerabilities through public GitHub issues.
Instead, please:
Your report should include:
  • Product version
  • A clear description of the vulnerability
  • Steps to reproduce the issue (clear, step-by-step instructions are greatly appreciated)
  • Any other details that may assist our investigation
If you require encrypted communication, please request it in your initial message.
Note: This process is for confidential reporting of software vulnerabilities only.
For general support or configuration help, see
Nextcloud Support.
What to Expect After Reporting
In most cases, you should receive an initial response within 24 hours.
A member of our security team will:
  • Confirm the vulnerability
  • Assess its impact
  • Follow up with any questions
  • Coordinate the fix and public disclosure
We apply, test, and release fixes for all relevant, supported stable branches in the next
security update. Vulnerabilities are publicly announced after the fix is released. As a thank
you, we will add your name to our Hall of Fame.
If your report concerns an app not maintained by Nextcloud (e.g., community-maintained apps
hosted by Nextcloud or hosted elsewhere), our security team will coordinate with the current
maintainer to help resolve the issue in a similar fashion.
Bug Bounties
If you are interested in a bug bounty, please note that complete, detailed reports can
contribute to higher bounty awards. Details on past bounties are available at
HackerOne.
Security Advisories
Published advisories for Nextcloud Server, Clients, and Apps are available at the
Nextcloud Security Advisories
page.
Supported Versions
Each major release of Nextcloud Server receives security updates for one year from its
initial release date. The Nextcloud project typically supports at least the two most recent
major releases.
To stay protected:
  • Ensure your Nextcloud Server is always running a supported major release
  • Promptly apply all maintenance releases (these include critical security and functionality
bug fixes)
  • Monitor the end-of-life (EOL) date for your major release (after this date, no further
maintenance releases will be published. Upgrading to a newer major release is strongly
recommended.)
See the
Maintenance and Release Schedule
for details.
Additional Information
 There aren't any published security advisories


, '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('^' + ".*" + '

Skip to content
Security: nextcloud/nextcloud-filelink
Security

SECURITY.md

Security Policy
💡 TLDR: Report security issues at hackerone.com/nextcloud
Found a security bug in Nextcloud? Let's get it fixed!
If you believe you have found an issue that meets our
definition of a security vulnerability,
we encourage you to let us know right away. Please use the reporting process described below.
If you are a...See section...
Security ResearcherHow to Report a Vulnerability
Nextcloud Admin or UserSecurity Advisories, Supported Versions
How to Report a Vulnerability
⚠️ Do not report security vulnerabilities through public GitHub issues.
Instead, please:
Your report should include:
  • Product version
  • A clear description of the vulnerability
  • Steps to reproduce the issue (clear, step-by-step instructions are greatly appreciated)
  • Any other details that may assist our investigation
If you require encrypted communication, please request it in your initial message.
Note: This process is for confidential reporting of software vulnerabilities only.
For general support or configuration help, see
Nextcloud Support.
What to Expect After Reporting
In most cases, you should receive an initial response within 24 hours.
A member of our security team will:
  • Confirm the vulnerability
  • Assess its impact
  • Follow up with any questions
  • Coordinate the fix and public disclosure
We apply, test, and release fixes for all relevant, supported stable branches in the next
security update. Vulnerabilities are publicly announced after the fix is released. As a thank
you, we will add your name to our Hall of Fame.
If your report concerns an app not maintained by Nextcloud (e.g., community-maintained apps
hosted by Nextcloud or hosted elsewhere), our security team will coordinate with the current
maintainer to help resolve the issue in a similar fashion.
Bug Bounties
If you are interested in a bug bounty, please note that complete, detailed reports can
contribute to higher bounty awards. Details on past bounties are available at
HackerOne.
Security Advisories
Published advisories for Nextcloud Server, Clients, and Apps are available at the
Nextcloud Security Advisories
page.
Supported Versions
Each major release of Nextcloud Server receives security updates for one year from its
initial release date. The Nextcloud project typically supports at least the two most recent
major releases.
To stay protected:
  • Ensure your Nextcloud Server is always running a supported major release
  • Promptly apply all maintenance releases (these include critical security and functionality
bug fixes)
  • Monitor the end-of-life (EOL) date for your major release (after this date, no further
maintenance releases will be published. Upgrading to a newer major release is strongly
recommended.)
See the
Maintenance and Release Schedule
for details.
Additional Information
 There aren't any published security advisories


, '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('^' + ".*" + '

Skip to content
Security: nextcloud/nextcloud-filelink
Security

SECURITY.md

Security Policy
💡 TLDR: Report security issues at hackerone.com/nextcloud
Found a security bug in Nextcloud? Let's get it fixed!
If you believe you have found an issue that meets our
definition of a security vulnerability,
we encourage you to let us know right away. Please use the reporting process described below.
If you are a...See section...
Security ResearcherHow to Report a Vulnerability
Nextcloud Admin or UserSecurity Advisories, Supported Versions
How to Report a Vulnerability
⚠️ Do not report security vulnerabilities through public GitHub issues.
Instead, please:
Your report should include:
  • Product version
  • A clear description of the vulnerability
  • Steps to reproduce the issue (clear, step-by-step instructions are greatly appreciated)
  • Any other details that may assist our investigation
If you require encrypted communication, please request it in your initial message.
Note: This process is for confidential reporting of software vulnerabilities only.
For general support or configuration help, see
Nextcloud Support.
What to Expect After Reporting
In most cases, you should receive an initial response within 24 hours.
A member of our security team will:
  • Confirm the vulnerability
  • Assess its impact
  • Follow up with any questions
  • Coordinate the fix and public disclosure
We apply, test, and release fixes for all relevant, supported stable branches in the next
security update. Vulnerabilities are publicly announced after the fix is released. As a thank
you, we will add your name to our Hall of Fame.
If your report concerns an app not maintained by Nextcloud (e.g., community-maintained apps
hosted by Nextcloud or hosted elsewhere), our security team will coordinate with the current
maintainer to help resolve the issue in a similar fashion.
Bug Bounties
If you are interested in a bug bounty, please note that complete, detailed reports can
contribute to higher bounty awards. Details on past bounties are available at
HackerOne.
Security Advisories
Published advisories for Nextcloud Server, Clients, and Apps are available at the
Nextcloud Security Advisories
page.
Supported Versions
Each major release of Nextcloud Server receives security updates for one year from its
initial release date. The Nextcloud project typically supports at least the two most recent
major releases.
To stay protected:
  • Ensure your Nextcloud Server is always running a supported major release
  • Promptly apply all maintenance releases (these include critical security and functionality
bug fixes)
  • Monitor the end-of-life (EOL) date for your major release (after this date, no further
maintenance releases will be published. Upgrading to a newer major release is strongly
recommended.)
See the
Maintenance and Release Schedule
for details.
Additional Information
 There aren't any published security advisories


, '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" + '

Skip to content
Security: nextcloud/nextcloud-filelink
Security

SECURITY.md

Security Policy
💡 TLDR: Report security issues at hackerone.com/nextcloud
Found a security bug in Nextcloud? Let's get it fixed!
If you believe you have found an issue that meets our
definition of a security vulnerability,
we encourage you to let us know right away. Please use the reporting process described below.
If you are a...See section...
Security ResearcherHow to Report a Vulnerability
Nextcloud Admin or UserSecurity Advisories, Supported Versions
How to Report a Vulnerability
⚠️ Do not report security vulnerabilities through public GitHub issues.
Instead, please:
Your report should include:
  • Product version
  • A clear description of the vulnerability
  • Steps to reproduce the issue (clear, step-by-step instructions are greatly appreciated)
  • Any other details that may assist our investigation
If you require encrypted communication, please request it in your initial message.
Note: This process is for confidential reporting of software vulnerabilities only.
For general support or configuration help, see
Nextcloud Support.
What to Expect After Reporting
In most cases, you should receive an initial response within 24 hours.
A member of our security team will:
  • Confirm the vulnerability
  • Assess its impact
  • Follow up with any questions
  • Coordinate the fix and public disclosure
We apply, test, and release fixes for all relevant, supported stable branches in the next
security update. Vulnerabilities are publicly announced after the fix is released. As a thank
you, we will add your name to our Hall of Fame.
If your report concerns an app not maintained by Nextcloud (e.g., community-maintained apps
hosted by Nextcloud or hosted elsewhere), our security team will coordinate with the current
maintainer to help resolve the issue in a similar fashion.
Bug Bounties
If you are interested in a bug bounty, please note that complete, detailed reports can
contribute to higher bounty awards. Details on past bounties are available at
HackerOne.
Security Advisories
Published advisories for Nextcloud Server, Clients, and Apps are available at the
Nextcloud Security Advisories
page.
Supported Versions
Each major release of Nextcloud Server receives security updates for one year from its
initial release date. The Nextcloud project typically supports at least the two most recent
major releases.
To stay protected:
  • Ensure your Nextcloud Server is always running a supported major release
  • Promptly apply all maintenance releases (these include critical security and functionality
bug fixes)
  • Monitor the end-of-life (EOL) date for your major release (after this date, no further
maintenance releases will be published. Upgrading to a newer major release is strongly
recommended.)
See the
Maintenance and Release Schedule
for details.
Additional Information
 There aren't any published security advisories


, '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('^' + ".*" + '

Skip to content
Security: nextcloud/nextcloud-filelink
Security

SECURITY.md

Security Policy
💡 TLDR: Report security issues at hackerone.com/nextcloud
Found a security bug in Nextcloud? Let's get it fixed!
If you believe you have found an issue that meets our
definition of a security vulnerability,
we encourage you to let us know right away. Please use the reporting process described below.
If you are a...See section...
Security ResearcherHow to Report a Vulnerability
Nextcloud Admin or UserSecurity Advisories, Supported Versions
How to Report a Vulnerability
⚠️ Do not report security vulnerabilities through public GitHub issues.
Instead, please:
Your report should include:
  • Product version
  • A clear description of the vulnerability
  • Steps to reproduce the issue (clear, step-by-step instructions are greatly appreciated)
  • Any other details that may assist our investigation
If you require encrypted communication, please request it in your initial message.
Note: This process is for confidential reporting of software vulnerabilities only.
For general support or configuration help, see
Nextcloud Support.
What to Expect After Reporting
In most cases, you should receive an initial response within 24 hours.
A member of our security team will:
  • Confirm the vulnerability
  • Assess its impact
  • Follow up with any questions
  • Coordinate the fix and public disclosure
We apply, test, and release fixes for all relevant, supported stable branches in the next
security update. Vulnerabilities are publicly announced after the fix is released. As a thank
you, we will add your name to our Hall of Fame.
If your report concerns an app not maintained by Nextcloud (e.g., community-maintained apps
hosted by Nextcloud or hosted elsewhere), our security team will coordinate with the current
maintainer to help resolve the issue in a similar fashion.
Bug Bounties
If you are interested in a bug bounty, please note that complete, detailed reports can
contribute to higher bounty awards. Details on past bounties are available at
HackerOne.
Security Advisories
Published advisories for Nextcloud Server, Clients, and Apps are available at the
Nextcloud Security Advisories
page.
Supported Versions
Each major release of Nextcloud Server receives security updates for one year from its
initial release date. The Nextcloud project typically supports at least the two most recent
major releases.
To stay protected:
  • Ensure your Nextcloud Server is always running a supported major release
  • Promptly apply all maintenance releases (these include critical security and functionality
bug fixes)
  • Monitor the end-of-life (EOL) date for your major release (after this date, no further
maintenance releases will be published. Upgrading to a newer major release is strongly
recommended.)
See the
Maintenance and Release Schedule
for details.
Additional Information
 There aren't any published security advisories


, '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
Security: nextcloud/nextcloud-filelink
Security

SECURITY.md

Security Policy
💡 TLDR: Report security issues at hackerone.com/nextcloud
Found a security bug in Nextcloud? Let's get it fixed!
If you believe you have found an issue that meets our
definition of a security vulnerability,
we encourage you to let us know right away. Please use the reporting process described below.
If you are a...See section...
Security ResearcherHow to Report a Vulnerability
Nextcloud Admin or UserSecurity Advisories, Supported Versions
How to Report a Vulnerability
⚠️ Do not report security vulnerabilities through public GitHub issues.
Instead, please:
Your report should include:
  • Product version
  • A clear description of the vulnerability
  • Steps to reproduce the issue (clear, step-by-step instructions are greatly appreciated)
  • Any other details that may assist our investigation
If you require encrypted communication, please request it in your initial message.
Note: This process is for confidential reporting of software vulnerabilities only.
For general support or configuration help, see
Nextcloud Support.
What to Expect After Reporting
In most cases, you should receive an initial response within 24 hours.
A member of our security team will:
  • Confirm the vulnerability
  • Assess its impact
  • Follow up with any questions
  • Coordinate the fix and public disclosure
We apply, test, and release fixes for all relevant, supported stable branches in the next
security update. Vulnerabilities are publicly announced after the fix is released. As a thank
you, we will add your name to our Hall of Fame.
If your report concerns an app not maintained by Nextcloud (e.g., community-maintained apps
hosted by Nextcloud or hosted elsewhere), our security team will coordinate with the current
maintainer to help resolve the issue in a similar fashion.
Bug Bounties
If you are interested in a bug bounty, please note that complete, detailed reports can
contribute to higher bounty awards. Details on past bounties are available at
HackerOne.
Security Advisories
Published advisories for Nextcloud Server, Clients, and Apps are available at the
Nextcloud Security Advisories
page.
Supported Versions
Each major release of Nextcloud Server receives security updates for one year from its
initial release date. The Nextcloud project typically supports at least the two most recent
major releases.
To stay protected:
  • Ensure your Nextcloud Server is always running a supported major release
  • Promptly apply all maintenance releases (these include critical security and functionality
bug fixes)
  • Monitor the end-of-life (EOL) date for your major release (after this date, no further
maintenance releases will be published. Upgrading to a newer major release is strongly
recommended.)
See the
Maintenance and Release Schedule
for details.
Additional Information
 There aren't any published security advisories


, '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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Security: nextcloud/nextcloud-filelink
Security

SECURITY.md

Security Policy
💡 TLDR: Report security issues at hackerone.com/nextcloud
Found a security bug in Nextcloud? Let's get it fixed!
If you believe you have found an issue that meets our
definition of a security vulnerability,
we encourage you to let us know right away. Please use the reporting process described below.
If you are a...See section...
Security ResearcherHow to Report a Vulnerability
Nextcloud Admin or UserSecurity Advisories, Supported Versions
How to Report a Vulnerability
⚠️ Do not report security vulnerabilities through public GitHub issues.
Instead, please:
Your report should include:
  • Product version
  • A clear description of the vulnerability
  • Steps to reproduce the issue (clear, step-by-step instructions are greatly appreciated)
  • Any other details that may assist our investigation
If you require encrypted communication, please request it in your initial message.
Note: This process is for confidential reporting of software vulnerabilities only.
For general support or configuration help, see
Nextcloud Support.
What to Expect After Reporting
In most cases, you should receive an initial response within 24 hours.
A member of our security team will:
  • Confirm the vulnerability
  • Assess its impact
  • Follow up with any questions
  • Coordinate the fix and public disclosure
We apply, test, and release fixes for all relevant, supported stable branches in the next
security update. Vulnerabilities are publicly announced after the fix is released. As a thank
you, we will add your name to our Hall of Fame.
If your report concerns an app not maintained by Nextcloud (e.g., community-maintained apps
hosted by Nextcloud or hosted elsewhere), our security team will coordinate with the current
maintainer to help resolve the issue in a similar fashion.
Bug Bounties
If you are interested in a bug bounty, please note that complete, detailed reports can
contribute to higher bounty awards. Details on past bounties are available at
HackerOne.
Security Advisories
Published advisories for Nextcloud Server, Clients, and Apps are available at the
Nextcloud Security Advisories
page.
Supported Versions
Each major release of Nextcloud Server receives security updates for one year from its
initial release date. The Nextcloud project typically supports at least the two most recent
major releases.
To stay protected:
  • Ensure your Nextcloud Server is always running a supported major release
  • Promptly apply all maintenance releases (these include critical security and functionality
bug fixes)
  • Monitor the end-of-life (EOL) date for your major release (after this date, no further
maintenance releases will be published. Upgrading to a newer major release is strongly
recommended.)
See the
Maintenance and Release Schedule
for details.
Additional Information
 There aren't any published security advisories