What’s Vulnerable › Vulnerabilities

CVE-2025-55289: Chamilo: Stored Cross Site Scripting in Skills Argumentation

• Severity: critical (CVSS 9.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-06 · updated 2026-06-17
• Weakness: CWE-79

Description

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.

Affected products

• chamilo-lms: before 1.11.34 — fixed in 1.11.34

How to fix

Upgrade to a fixed version: chamilo-lms 1.11.34. Check the vendor advisory for mitigations.

References

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

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