Auth bypass in Chamilo Chamilo-lms
CVE-2026-34602
Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, the /api/course_rel_users endpoint is vulnerable to Insecure Direct Object Reference (IDOR), allowing an authenticated attacker to modify the user p…
Vulnerability class: IDOR (Insecure Direct Object Reference)
EPSS: 0.000 (10.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N.
Affected products
- Chamilo Chamilo-lms — versions < 2.0.0-RC.3
Weakness classification (CWE)
References
- https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-x373-8j9j-g5pj (x_refsource_CONFIRM)
- https://github.com/chamilo/chamilo-lms/commit/2a9f060fa9d50fc9a92ed93af774d2619642df92 (x_refsource_MISC)
- https://github.com/chamilo/chamilo-lms/commit/bd2ba34c2e74475587e38c74c90c2934e69c8779 (x_refsource_MISC)
- https://github.com/chamilo/chamilo-lms/commit/c9c30cdc48afae57cd6ab012ae2eceafd351a40e (x_refsource_MISC)
- https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.0-RC.3 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-34602?
- CVE-2026-34602 is a high-severity vulnerability in Chamilo Chamilo-lms, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.1/10. Published 2026-04-14.
- How severe is CVE-2026-34602?
- High severity. CVSS v3 base score is 7.1 out of 10.