Vulnerability Description
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 parameter in the request body to enroll any arbitrary user into any course without proper authorization checks. The backend trusts the user-supplied input for the user field and performs no server-side verification that the requester owns the referenced user ID or has permission to act on behalf of other users. This enables unauthorized manipulation of user-course relationships, potentially granting unintended access to course materials, bypassing enrollment controls, and compromising platform integrity. This issue has been fixed in version 2.0.0-RC.3.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Chamilo | Chamilo Lms | <= 1.11.38 |
Related Weaknesses (CWE)
References
- https://github.com/chamilo/chamilo-lms/commit/2a9f060fa9d50fc9a92ed93af774d26196Patch
- https://github.com/chamilo/chamilo-lms/commit/bd2ba34c2e74475587e38c74c90c2934e6Patch
- https://github.com/chamilo/chamilo-lms/commit/c9c30cdc48afae57cd6ab012ae2eceafd3Patch
- https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.0-RC.3ProductRelease Notes
- https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-x373-8j9j-g5pjVendor Advisory
FAQ
What is CVE-2026-34602?
CVE-2026-34602 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 auth...
How severe is CVE-2026-34602?
CVE-2026-34602 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34602?
Check the references section above for vendor advisories and patch information. Affected products include: Chamilo Chamilo Lms.