CVE-2025-55289

HIGH 8.8

Chamilo: Stored Cross Site Scripting in Skills Argumentation

CVSS Score

8.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	chamilo
Product	chamilo-lms
Published	Mar 6, 2026
Last Updated	Mar 6, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

chamilo / chamilo-lms

< 1.11.34

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-cchj-3qmf-82j5 github.com: https://github.com/chamilo/chamilo-lms/releases/tag/v1.11.34