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CVE-2026-34602

Chamilo LMS: IDOR in /api/course_rel_users Allows Unauthorized Enrollment of Arbitrary Users into Courses

Published: Apr 14, 2026Updated: Apr 22, 2026 Sources: CVE List NVDCWE-639
NVD MITRE
7.1CVSSHIGH
EPSS Score
0.2%
Top 89.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-639

Affected Products

chamilo-lmschamilo
On-premWeb App
Enterprise Software / collaboration-groupware
chamilo lmschamilo
On-premWeb App
Enterprise Software / itsm-monitoring
chamilooss-projectEnterprise Softwareaka chamilo-lms

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
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References

https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-x373-8j9j-g5pj
github.com
https://github.com/chamilo/chamilo-lms/commit/2a9f060fa9d50fc9a92ed93af774d2619642df92
github.com
https://github.com/chamilo/chamilo-lms/commit/bd2ba34c2e74475587e38c74c90c2934e69c8779
github.com
and 2 more references View all →

Timeline

Published
Apr 14, 2026
Last Updated
Apr 22, 2026

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