CVE-2026-33703 Chamilo LMS Critical IDOR: Any Authenticated User Can Extract All Users’ Personal Data and API Tokens

High 7.1 Published 10 Apr 2026 Updated 14 Apr 2026

Authenticated users can access other users' personal data and API tokens via IDOR, leading to mass data disclosure and potential account takeover.

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

What is CVE-2026-33703?

CVE-2026-33703 is a high-severity vulnerability in Chamilo Chamilo Lms, published on 10 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Chamilo LMS is a learning management system. Prior to 2.0.0-RC.3, an Insecure Direct Object Reference (IDOR) vulnerability in the /social-network/personal-data/{userId} endpoint allows any authenticated user to access full personal data and API tokens of arbitrary users by modifying the userId parameter. This results in mass disclosure of sensitive user information and credentials, enabling a full platform data breach. This vulnerability is fixed in 2.0.0-RC.3.

Weakness: CWE-639

Which versions are affected by CVE-2026-33703?

It affects 1 product.

Products include Chamilo Chamilo Lms.

How do I fix CVE-2026-33703?

No fix has been published for CVE-2026-33703 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-33703 being exploited?

There is no known exploitation of CVE-2026-33703 in the wild and no public exploit code.

All Chamilo Chamilo Lms vulnerabilities

Sources

Also known as GHSA-27x6-c5c7-gpf5.