EUVD-2026-21541
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Lifecycle Timeline
3Tags
Description
Chamilo LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, Chamilo LMS contains an Insecure Direct Object Reference (IDOR) vulnerability in the Learning Path progress saving endpoint. The file lp_ajax_save_item.php accepts a uid (user ID) parameter directly from $_REQUEST and uses it to load and modify another user's Learning Path progress - including score, status, completion, and time - without verifying that the requesting user matches the target user ID. Any authenticated user enrolled in a course can overwrite another user's Learning Path progress by simply changing the uid parameter in the request. This vulnerability is fixed in 1.11.38 and 2.0.0-RC.3.
Analysis
Insecure Direct Object Reference in Chamilo LMS versions prior to 1.11.38 and 2.0.0-RC.3 allows authenticated users enrolled in a course to manipulate arbitrary Learning Path progress data for other users. The lp_ajax_save_item.php endpoint accepts a uid parameter without ownership validation, enabling attackers to overwrite scores, completion status, and time tracking for any enrolled user by modifying the request parameter. …
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Remediation
Within 24 hours: Identify all Chamilo LMS instances in production and document current versions. Within 7 days: Upgrade Chamilo LMS to version 1.11.38 or 2.0.0-RC.3 or later; test in staging environment first. …
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