CVE-2025-59543 Chamilo: Account Takeover via Stored XSS in Course Description

Critical 9.1 Published 6 Mar 2026 Updated 9 Mar 2026

Attackers can inject malicious scripts into course descriptions to steal session cookies and take over administrator accounts in Chamilo LMS.

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

What is CVE-2025-59543?

CVE-2025-59543 is a critical cross-site scripting vulnerability in Chamilo Chamilo Lms, published on 6 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Chamilo is a learning management system. Prior to version 1.11.34, there is a stored cross-site scripting (XSS) vulnerability. By injecting malicious JavaScript into the course description field, an attacker with a low-privileged account (e.g., trainer) can execute arbitrary JavaScript code in the context of any other user viewing the course information page, including administrators. This allows an attacker to exfiltrate sensitive session cookies or tokens, resulting in account takeover (ATO) of higher-privileged users. This issue has been patched in version 1.11.34.

Weakness: CWE-79

Which versions are affected by CVE-2025-59543?

It affects 1 product.

Products include Chamilo Chamilo Lms.

How do I fix CVE-2025-59543?

No fix has been published for CVE-2025-59543 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-2025-59543 being exploited?

There is no known exploitation of CVE-2025-59543 in the wild and no public exploit code.

All Chamilo Chamilo Lms vulnerabilities

Sources

Also known as GHSA-p32q-6gh3-3gcv.