CVE-2025-52563 Chamilo: Reflected XSS via page parameter

Medium 5.1 Published 2 Mar 2026 Updated 3 Mar 2026

Attackers can execute arbitrary scripts in victim browsers via the page parameter in Chamilo LMS, potentially leading to session hijacking.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2025-52563?

CVE-2025-52563 is a medium-severity cross-site scripting vulnerability in Chamilo Chamilo Lms, published on 2 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Chamilo is a learning management system. Prior to version 1.11.30, there is a reflected cross-site scripting (XSS) vulnerability due to insufficient sanitization of the page parameter in the session/add_users_to_session.php endpoint. This issue has been patched in version 1.11.30.

Weakness: CWE-87, CWE-80, CWE-79

Which versions are affected by CVE-2025-52563?

It affects 1 product.

Products include Chamilo Chamilo Lms.

How do I fix CVE-2025-52563?

No fix has been published for CVE-2025-52563 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2025-52563 being exploited?

There is no known exploitation of CVE-2025-52563 in the wild and no public exploit code.

All Chamilo Chamilo Lms vulnerabilities

Sources

Also known as GHSA-h3m8-53j3-xjx8.