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Chamilo LmsApplication · Chamilo

CVE-2025-55289

CRITICAL · 9.0 CVSS v3.1 Published 2026-03-06
Fix available
A fix is available. Upgrade to 1.11.34 or later.
See remediation →
94/100
Remediation priority · Urgent
Remotely reachable

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
Chamilo is a learning management system. Prior to version 1.11.34, there is a stored XSS vulnerability in Chamilo LMS (Verison 1.11.32) allows an attacker to inject arbitrary JavaScript into the platform’s social network and internal messaging features. When viewed by an authenticated user (including administrators), the payload executes in their browser within the LMS context. This enables full account takeover via session hijacking, unauthorized actions with the victim’s privileges, exfiltration of sensitive data, and potential self-propagation to other users. This issue has been patched in version 1.11.34.

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 · high confidence

A stored XSS vulnerability in Chamilo LMS versions prior to 1.11.34 allows authenticated attackers to inject malicious JavaScript into social network and internal messaging features. When other users view the crafted content, the payload executes in their browser within the LMS context, enabling session hijacking, account takeover, and data exfiltration.

MitigationUpgrade to Chamilo LMS version 1.11.34 or later to apply the security patch that addresses the stored XSS vulnerability in social network and messaging components.

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
Chamilo LmsApplication
Affected:< 1.11.34

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
Low
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/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 Chamilo LMS version
    Log into the admin panel and navigate to Administration > Configuration > Platform or check the version.php file in the installation directory. Alternatively, look for a version marker in the footer of the platform or in a config file named version.php or constants.php.
    Affected if The installed version is any version prior to 1.11.34 (e.g., 1.11.0 through 1.11.33).
  2. Verify social network feature is enabled
    Check the Chamilo configuration panel under Administration > Configuration > Tools, or inspect the main/inc/conf/configuration.php file for the setting that controls the social network plugin or tool.
    Affected if The social_network or social_tool configuration option is set to enabled or true.
  3. Verify internal messaging is enabled
    Check the messaging plugin status in Administration > Plugins or look for enable_messaging or messaging_tool in the configuration file.
    Affected if The internal messaging feature is active in the platform settings.
  4. Inspect social network input handling
    Navigate to the social profile or wall feature as a test user and examine how user-provided content is handled in the code files under main/social or similar paths. Look for lack of sanitization on user inputs in the profile fields or wall posts.
    Affected if The code does not sanitize HTML/JavaScript input in social network profile fields, wall posts, or status updates.

You are affected if your Chamilo LMS version is below 1.11.34 AND either the social network or internal messaging feature is enabled, allowing unsanitized user content to be stored and displayed to other 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 1.11.34 or later
Fixed in 1.11.34
Interim mitigation

Upgrade to Chamilo LMS version 1.11.34 or later to apply the security patch that addresses the stored XSS vulnerability in social network and messaging components.

Recommended fix High confidence

1.11.34

  1. 1. Identify the current Chamilo LMS version by checking the version.php file in the installation root directory
  2. 2. Create a complete backup of the Chamilo database and all application files
  3. 3. Download Chamilo LMS version 1.11.34 from the official Chamilo repository (github.com/chamilo/chamilo-lms)
  4. 4. Extract the new version files to the web server document root, preserving configuration (main/inc/conf/configuration.php)
  5. 5. Run the database upgrade script by accessing the portal as administrator or executing the upgrade via command line
  6. 6. Clear all application caches (main/cache/ and temporary directories)
  7. 7. Verify the upgrade was successful by checking the version number in the admin panel
  8. 8. Test the social network and internal messaging features to confirm the XSS vulnerability is remediated

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

Fix this in Chamilo Lms Scoped from the published advisory
  • Consultation3.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA3.0 h
20.0 hours of engineering $3,480
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,568.

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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-2025-55289 in production — separate from our analysis above.

No notes yet

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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