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CVE-2026-34602

HIGH CVSS 3.1: 7.1
Updated Apr 17, 2026
Chamilo
Parameter Value
CVSS 7.1 (HIGH)
Affected Versions before 2.0.0
Fixed In 2.0.0
Type CWE-639 (Authorization Bypass)
Vendor Chamilo
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
Low
Partial data leak
Integrity
High
Complete data modification
Availability
None
No disruption

CVSS Vector v3.1

Weakness Type (CWE)

CWE-639 Authorization Bypass

References 5

https://github.com/chamilo/chamilo-lms/commit/2a9f060fa9d50fc9a92ed93af774d2619…
security-advisories@github.com
https://github.com/chamilo/chamilo-lms/commit/bd2ba34c2e74475587e38c74c90c2934e…
security-advisories@github.com
https://github.com/chamilo/chamilo-lms/commit/c9c30cdc48afae57cd6ab012ae2eceafd…
security-advisories@github.com
https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.0-RC.3
security-advisories@github.com
https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-x373-8j9j-g5pj
security-advisories@github.com
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