CVE-2025-52564: Chamilo: HTML injection via open parameter

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-02 · updated 2026-06-17
Weakness: CWE-80

Description

Chamilo is a learning management system. Prior to version 1.11.30, the open parameter of help.php fails to properly sanitize user input. This allows an attacker to inject arbitrary HTML, such as underlined text, via a crafted URL. This issue has been patched in version 1.11.30.

Affected products

chamilo-lms: before 1.11.30 — fixed in 1.11.30

How to fix

Upgrade to a fixed version: chamilo-lms 1.11.30. Check the vendor advisory for mitigations.

References

https://github.com/chamilo/chamilo-lms/commit/083b1d2b0c29b0cc0313a28165ad47bebae9dcb2
https://github.com/chamilo/chamilo-lms/commit/1ee2d8bb61b67e08946cd80b1a9b92c1a9959c7b
https://github.com/chamilo/chamilo-lms/releases/tag/v1.11.30
https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-6fmm-qrx4-wgqc

Get alerted when CVE-2025-52564 or the next vulnerability affects your stack