Vulnerability Details 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 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 9.2%
CVSS Severity
CVSS v3 Score 7.1
References
- https://github.com/chamilo/chamilo-lms/commit/2a9f060fa9d50fc9a92ed93af774d2619642df92
- https://github.com/chamilo/chamilo-lms/commit/bd2ba34c2e74475587e38c74c90c2934e69c8779
- https://github.com/chamilo/chamilo-lms/commit/c9c30cdc48afae57cd6ab012ae2eceafd351a40e
- https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.0-RC.3
- https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-x373-8j9j-g5pj
Products affected by CVE-2026-34602
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cpe:2.3:a:chamilo:chamilo_lms:1.10.0
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cpe:2.3:a:chamilo:chamilo_lms:1.10.2
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cpe:2.3:a:chamilo:chamilo_lms:1.10.4
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cpe:2.3:a:chamilo:chamilo_lms:1.10.6
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cpe:2.3:a:chamilo:chamilo_lms:1.10.8
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cpe:2.3:a:chamilo:chamilo_lms:1.11.0
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cpe:2.3:a:chamilo:chamilo_lms:1.11.10
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cpe:2.3:a:chamilo:chamilo_lms:1.11.12
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cpe:2.3:a:chamilo:chamilo_lms:1.11.14
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cpe:2.3:a:chamilo:chamilo_lms:1.11.16
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cpe:2.3:a:chamilo:chamilo_lms:1.11.18
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cpe:2.3:a:chamilo:chamilo_lms:1.11.2
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cpe:2.3:a:chamilo:chamilo_lms:1.11.20
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cpe:2.3:a:chamilo:chamilo_lms:1.11.22
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cpe:2.3:a:chamilo:chamilo_lms:1.11.24
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cpe:2.3:a:chamilo:chamilo_lms:1.11.26
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cpe:2.3:a:chamilo:chamilo_lms:1.11.28
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cpe:2.3:a:chamilo:chamilo_lms:1.11.30
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cpe:2.3:a:chamilo:chamilo_lms:1.11.32
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cpe:2.3:a:chamilo:chamilo_lms:1.11.34
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cpe:2.3:a:chamilo:chamilo_lms:1.11.36
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cpe:2.3:a:chamilo:chamilo_lms:1.11.4
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cpe:2.3:a:chamilo:chamilo_lms:1.11.6
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cpe:2.3:a:chamilo:chamilo_lms:1.11.8
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cpe:2.3:a:chamilo:chamilo_lms:1.8.6.1
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cpe:2.3:a:chamilo:chamilo_lms:1.8.6.2
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cpe:2.3:a:chamilo:chamilo_lms:1.8.7
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cpe:2.3:a:chamilo:chamilo_lms:1.8.7.1
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cpe:2.3:a:chamilo:chamilo_lms:1.8.8
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cpe:2.3:a:chamilo:chamilo_lms:1.8.8.2
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cpe:2.3:a:chamilo:chamilo_lms:1.8.8.3
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cpe:2.3:a:chamilo:chamilo_lms:1.8.8.4
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cpe:2.3:a:chamilo:chamilo_lms:1.8.8.6
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cpe:2.3:a:chamilo:chamilo_lms:1.9.0
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cpe:2.3:a:chamilo:chamilo_lms:1.9.10
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cpe:2.3:a:chamilo:chamilo_lms:1.9.10.2
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cpe:2.3:a:chamilo:chamilo_lms:1.9.10.4
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cpe:2.3:a:chamilo:chamilo_lms:1.9.2
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cpe:2.3:a:chamilo:chamilo_lms:1.9.4
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cpe:2.3:a:chamilo:chamilo_lms:1.9.6
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cpe:2.3:a:chamilo:chamilo_lms:1.9.6.1
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cpe:2.3:a:chamilo:chamilo_lms:1.9.8
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cpe:2.3:a:chamilo:chamilo_lms:1.9.8.1
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cpe:2.3:a:chamilo:chamilo_lms:1.9.8.2
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cpe:2.3:a:chamilo:chamilo_lms:2.0.0