CVE-2026-34602: CWE-639: Authorization Bypass Through User-Controlled Key in chamilo chamilo-lms
Chamilo LMS versions prior to 2. 0. 0-RC. 3 contain an authorization bypass vulnerability in the /api/course_rel_users endpoint. An authenticated attacker can manipulate the user parameter to enroll arbitrary users into courses without proper authorization. This occurs because the backend does not verify ownership or permission for the user ID supplied. The vulnerability allows unauthorized access to course materials and compromises enrollment controls. The issue is fixed in version 2. 0. 0-RC.
AI Analysis
Technical Summary
CVE-2026-34602 is an authorization bypass vulnerability (CWE-639) in Chamilo LMS before version 2.0.0-RC.3. The /api/course_rel_users API endpoint improperly trusts user-supplied input for the user field, lacking server-side verification that the requester is authorized to act on behalf of the specified user ID. This insecure direct object reference (IDOR) flaw allows an authenticated attacker to enroll any arbitrary user into any course, bypassing enrollment restrictions and potentially exposing course content to unauthorized users. The vulnerability has been addressed in Chamilo LMS version 2.0.0-RC.3.
Potential Impact
Exploitation of this vulnerability allows an authenticated attacker to enroll arbitrary users into courses without authorization, potentially granting unauthorized access to course materials and compromising the integrity of enrollment controls within the Chamilo LMS platform. The confidentiality and integrity of course enrollment data can be impacted. There is no indication of availability impact. No known exploits in the wild have been reported.
Mitigation Recommendations
This vulnerability is fixed in Chamilo LMS version 2.0.0-RC.3. Users should upgrade to this version or later to remediate the issue. Since this is not a cloud service, patching the affected software is required to mitigate the risk. Patch status is confirmed by the vendor advisory stating the fix is included in version 2.0.0-RC.3.
CVE-2026-34602: CWE-639: Authorization Bypass Through User-Controlled Key in chamilo chamilo-lms
Description
Chamilo LMS versions prior to 2. 0. 0-RC. 3 contain an authorization bypass vulnerability in the /api/course_rel_users endpoint. An authenticated attacker can manipulate the user parameter to enroll arbitrary users into courses without proper authorization. This occurs because the backend does not verify ownership or permission for the user ID supplied. The vulnerability allows unauthorized access to course materials and compromises enrollment controls. The issue is fixed in version 2. 0. 0-RC.
CVSS v3.1
Score 7.1high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-34602 is an authorization bypass vulnerability (CWE-639) in Chamilo LMS before version 2.0.0-RC.3. The /api/course_rel_users API endpoint improperly trusts user-supplied input for the user field, lacking server-side verification that the requester is authorized to act on behalf of the specified user ID. This insecure direct object reference (IDOR) flaw allows an authenticated attacker to enroll any arbitrary user into any course, bypassing enrollment restrictions and potentially exposing course content to unauthorized users. The vulnerability has been addressed in Chamilo LMS version 2.0.0-RC.3.
Potential Impact
Exploitation of this vulnerability allows an authenticated attacker to enroll arbitrary users into courses without authorization, potentially granting unauthorized access to course materials and compromising the integrity of enrollment controls within the Chamilo LMS platform. The confidentiality and integrity of course enrollment data can be impacted. There is no indication of availability impact. No known exploits in the wild have been reported.
Mitigation Recommendations
This vulnerability is fixed in Chamilo LMS version 2.0.0-RC.3. Users should upgrade to this version or later to remediate the issue. Since this is not a cloud service, patching the affected software is required to mitigate the risk. Patch status is confirmed by the vendor advisory stating the fix is included in version 2.0.0-RC.3.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-30T17:15:52.500Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69deb5cc82d89c981f06f4c8
Added to database: 4/14/2026, 9:46:52 PM
Last enriched: 4/22/2026, 6:50:13 AM
Last updated: 5/27/2026, 12:46:33 PM
Views: 57
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