dbcve.org
SerendipityApplication · S9y

CVE-2011-1134

CRITICAL · 9.8 CVSS v3.1 Published 2019-11-05
Fix available
A fix is available. Upgrade to 1.5.5 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
Cross-Site Scripting (XSS) in Xinha, as included in the Serendipity package before 1.5.5, allows remote attackers to execute arbitrary code in the image manager.

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 confidence

Cross-Site Scripting (XSS) vulnerability in the Xinha WYSIWYG editor component bundled with Serendipity CMS versions prior to 1.5.5. The vulnerability exists in the image manager functionality, allowing remote attackers to inject malicious scripts that execute in the context of authenticated users' sessions.

MitigationUpgrade Serendipity to version 1.5.5 or later which includes the patched Xinha component, or temporarily disable the image manager functionality if immediate patching is not feasible.

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
SerendipityApplication
Affected:< 1.5.5

CVSS 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
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 checks

Work through these to decide whether this CVE applies to you.

  1. Check installed Serendipity version
    Locate the VERSION file in the Serendipity root directory or check the version displayed in the Serendipity admin dashboard under 'About Serendipity' or 'System Information'.
    Affected if The installed version is any release prior to 1.5.5 (e.g., 1.5.4, 1.5.3, 1.4.x, etc.).
  2. Verify Xinha editor is bundled
    Check for the presence of the 'xinha' directory or 'Xinha' folder within the Serendipity installation, typically found under '/plugins/serendipity_event_xinha/' or '/include/plugins/xinha/' in the Serendipity file structure.
    Affected if The Xinha editor component directory exists in the Serendipity installation.
  3. Confirm image manager is accessible
    Log into the Serendipity admin panel and navigate to the 'Images' section or media library, which invokes the Xinha image manager functionality. Alternatively, check if the 'serendipity_event_xinha' plugin is installed and activated in the plugin manager.
    Affected if The image manager/media library feature is accessible and the Xinha plugin is active.

The environment is affected if Serendipity version is below 1.5.5 AND the Xinha WYSIWYG editor is installed with its image manager functionality accessible to authenticated users.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 1.5.5 or later
Fixed in 1.5.5
Interim mitigation

Upgrade Serendipity to version 1.5.5 or later which includes the patched Xinha component, or temporarily disable the image manager functionality if immediate patching is not feasible.

Recommended fix High confidence

Serendipity 1.5.5

  1. 1. Create a complete backup of the Serendipity installation directory and database
  2. 2. Download Serendipity version 1.5.5 from the official source (blog.s9y.org or GitHub)
  3. 3. Extract the new version files
  4. 4. Replace the existing Serendipity files with the new version, preserving the templates, plugins, and configuration if required
  5. 5. Run the upgrade script or access the admin panel to complete the database migration if needed
  6. 6. Verify that the Xinha image manager is functioning correctly and that file uploads are properly restricted
  7. 7. Test that the vulnerability is no longer exploitable by attempting to upload a file with malicious content
Caveat Minor: Review custom templates and plugins for compatibility with 1.5.5 after upgrade

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Serendipity Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2011-1134 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2011-1134 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

What this is

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.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data