CVE-2026-40291: Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, an insecure direct object modification vulnerability in the PUT…

PriorityP260high8.8CVSS 3.1

AVNACLPRLUINSUCHIHAH

EPSS

0.32%

23.3th percentile

Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, an insecure direct object modification vulnerability in the PUT /api/users/{id} endpoint allows any authenticated user with ROLE_STUDENT to escalate their privileges to ROLE_ADMIN by modifying the roles field on their own user record. The API Platform security expression is_granted('EDIT', object) only verifies record ownership, and the roles field is included in the writable serialization group, enabling any user to set arbitrary roles such as ROLE_ADMIN. Successful exploitation grants full administrative control of the platform, including access to all courses, user data, grades, and administrative settings. This issue has been fixed in version 2.0.0-RC.3.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
chamilo	chamilo-lms	< 2.0-RC.3	2.0-RC.3
chamilo	chamilo_lms	<= 1.11.38	—
chamilo	chamilo_lms	—	—

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