CVE-2026-31940 Session Fixation in Chamilo LMS

High 7.5 Published 10 Apr 2026 Updated 14 Apr 2026

Attackers can hijack user sessions in Chamilo LMS by manipulating session IDs, potentially leading to account takeover.

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-2026-31940?

CVE-2026-31940 is a high-severity vulnerability in Chamilo Chamilo Lms, published on 10 Apr 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 LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, in main/lp/aicc_hacp.php, user-controlled request parameters are directly used to set the PHP session ID before loading global bootstrap. This leads to session fixation. This vulnerability is fixed in 1.11.38 and 2.0.0-RC.3.

Weakness: CWE-384

Which versions are affected by CVE-2026-31940?

It affects 1 product.

Products include Chamilo Chamilo Lms.

How do I fix CVE-2026-31940?

No fix has been published for CVE-2026-31940 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-31940 being exploited?

There is no known exploitation of CVE-2026-31940 in the wild and no public exploit code.

All Chamilo Chamilo Lms vulnerabilities

Sources

Also known as GHSA-4gp7-cfjh-77gv.