CVE-2026-33698 Chamilo LMS affected by unauthenticated RCE in main/install folder

Critical 9.3 Published 10 Apr 2026 Updated 15 Apr 2026

Unauthenticated attackers can execute PHP code and modify files in Chamilo LMS if the install directory is accessible.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-33698?

CVE-2026-33698 is a critical code injection vulnerability in Chamilo Chamilo Lms, published on 10 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Chamilo LMS is a learning management system. Prior to 1.11.38, a chained attack can enable otherwise-blocked PHP code from the main/install/ directory and allow an unauthenticated attacker to modify existing files or create new files where allowed by system permissions. This only affects portals with the main/install/ directory still present and read-accessible. This vulnerability is fixed in 1.11.38.

Weakness: CWE-552

Which versions are affected by CVE-2026-33698?

It affects 1 product.

Products include Chamilo Chamilo Lms.

How do I fix CVE-2026-33698?

No fix has been published for CVE-2026-33698 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-33698 being exploited?

There is no known exploitation of CVE-2026-33698 in the wild and no public exploit code.

All Chamilo Chamilo Lms vulnerabilities

Sources

Also known as GHSA-557g-2w66-gpmf.