Joomla\!Application · Joomla
CVE-2025-63083
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedLack of output escaping leads to a XSS vector in the pagebreak plugin.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceThis is a Cross-Site Scripting (XSS) vulnerability in the pagebreak plugin caused by insufficient output escaping. The plugin fails to properly sanitize or encode user-supplied input before rendering it in HTML pages, allowing attackers to inject malicious scripts that execute in the context of other users' browsers.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
Joomla\!Application
>= 3.9.0, < 5.4.2>= 6.0.0, < 6.0.2CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check your Joomla versionNavigate to System > Information > System Information in the admin panel, or check the libraries/cms/version.php file. The version is typically displayed in the administrator dashboard footer or in the version file.Affected if The installed version is >= 3.9.0 and < 5.4.2, OR >= 6.0.0 and < 6.0.2
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Locate the pagebreak pluginIn the Joomla admin, go to Content > Plugins and search for "pagebreak" or navigate to the plugins management page and locate the Page Break plugin.Affected if The pagebreak plugin is found and is enabled
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Verify if pagebreak functionality is in useReview your content articles for the presence of pagebreak tags (typically {pagebreak} or the pagebreak button used in the editor). Check articles that use multi-page article formatting.Affected if Articles contain pagebreak markers and the plugin is enabled
You are affected if your Joomla version falls within the vulnerable ranges AND the pagebreak plugin is enabled and used on your site.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped5.4.26.0.2
Implement proper output encoding/escaping for all user-controlled data rendered by the pagebreak plugin, following context-aware escaping rules (HTML, attribute, JavaScript, URL). Validate and sanitize inputs as an additional defense layer.
Joomla! 5.4.2 (or Joomla! 6.0.2 for 6.x branch)
- Backup your Joomla! database and files before making any changes
- Log into the Joomla! Administrator dashboard
- Navigate to System > Update > Joomla Update (or use Components > Joomla Update)
- Check for updates and install Joomla! version 5.4.2 (or 6.0.2 if running the 6.x branch)
- Verify the update completed successfully by checking the Joomla version at System > Information > Joomla Information
- Clear any caching systems (Joomla cache, CDN cache, browser cache)
- Test the pagebreak plugin functionality to ensure it still works correctly after the update
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Joomla\!
Scoped from the published advisory
- Consultation2.0 h
- Implementation3.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-63083 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-63083 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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