CVE-2026-33736: CWE-639: Authorization Bypass Through User-Controlled Key in chamilo chamilo-lms
Chamilo LMS versions from 2. 0. 0-alpha. 1 up to but not including 2. 0. 0-RC. 3 contain an authorization bypass vulnerability. Authenticated users, including those with student roles, can enumerate all platform users and access personal information such as email, phone numbers, and roles via the GET /api/users endpoint. This includes access to administrator account details. The vulnerability is fixed starting with version 2.
AI Analysis
Technical Summary
Chamilo LMS prior to version 2.0.0-RC.3 suffers from an authorization bypass vulnerability (CWE-639) that allows any authenticated user, including those with limited privileges like ROLE_STUDENT, to enumerate all users on the platform through the GET /api/users API endpoint. This unauthorized access exposes sensitive personal information such as email addresses, phone numbers, and user roles, including those of administrators. The vulnerability is resolved in version 2.0.0-RC.3.
Potential Impact
The vulnerability allows unauthorized disclosure of personal information of all users on the Chamilo LMS platform to any authenticated user, including those with minimal privileges. This could lead to privacy violations and potential targeting of privileged accounts, but does not allow modification or denial of service. The CVSS score of 6.5 reflects a medium impact primarily due to confidentiality loss.
Mitigation Recommendations
Upgrade Chamilo LMS to version 2.0.0-RC.3 or later, where this authorization bypass vulnerability has been fixed. Since no official patch or workaround is detailed beyond upgrading, applying this update is the recommended remediation. Patch status is not explicitly confirmed beyond the version fix note; verify with the vendor advisory for the latest remediation guidance.
CVE-2026-33736: CWE-639: Authorization Bypass Through User-Controlled Key in chamilo chamilo-lms
Description
Chamilo LMS versions from 2. 0. 0-alpha. 1 up to but not including 2. 0. 0-RC. 3 contain an authorization bypass vulnerability. Authenticated users, including those with student roles, can enumerate all platform users and access personal information such as email, phone numbers, and roles via the GET /api/users endpoint. This includes access to administrator account details. The vulnerability is fixed starting with version 2.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Chamilo LMS prior to version 2.0.0-RC.3 suffers from an authorization bypass vulnerability (CWE-639) that allows any authenticated user, including those with limited privileges like ROLE_STUDENT, to enumerate all users on the platform through the GET /api/users API endpoint. This unauthorized access exposes sensitive personal information such as email addresses, phone numbers, and user roles, including those of administrators. The vulnerability is resolved in version 2.0.0-RC.3.
Potential Impact
The vulnerability allows unauthorized disclosure of personal information of all users on the Chamilo LMS platform to any authenticated user, including those with minimal privileges. This could lead to privacy violations and potential targeting of privileged accounts, but does not allow modification or denial of service. The CVSS score of 6.5 reflects a medium impact primarily due to confidentiality loss.
Mitigation Recommendations
Upgrade Chamilo LMS to version 2.0.0-RC.3 or later, where this authorization bypass vulnerability has been fixed. Since no official patch or workaround is detailed beyond upgrading, applying this update is the recommended remediation. Patch status is not explicitly confirmed beyond the version fix note; verify with the vendor advisory for the latest remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-23T17:34:57.561Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d94d8f1cc7ad14dae0faf5
Added to database: 4/10/2026, 7:20:47 PM
Last enriched: 4/10/2026, 7:36:02 PM
Last updated: 4/10/2026, 9:34:45 PM
Views: 4
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