CVE-2026-40291 | Chamilo LMS up to 2.0-RC.2 /api/users/ privileges management

VDB-357653 · CVE-2026-40291 · GCVE-0-2026-40291 CHAMILO LMS UP TO 2.0-RC.2 /API/USERS/ PRIVILEGES MANAGEMENT HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.4 $0-$5k 1.13+ Summaryinfo A vulnerability identified as critical has been detected in Chamilo LMS up to 2.0-RC.2. Affected is an unknown function of the file /api/users/. The manipulation leads to privileges management. This vulnerability is listed as CVE-2026-40291. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component. Detailsinfo A vulnerability, which was classified as critical, has been found in Chamilo LMS up to 2.0-RC.2. This issue affects some unknown functionality of the file /api/users/. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is: Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, an insecure direct object modification vulnerability in the PUT /api/users/{id} endpoint allows any authenticated user with ROLE_STUDENT to escalate their privileges to ROLE_ADMIN by modifying the roles field on their own user record. The API Platform security expression is_granted('EDIT', object) only verifies record ownership, and the roles field is included in the writable serialization group, enabling any user to set arbitrary roles such as ROLE_ADMIN. Successful exploitation grants full administrative control of the platform, including access to all courses, user data, grades, and administrative settings. This issue has been fixed in version 2.0.0-RC.3. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-40291 since 04/10/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue. Upgrading to version 2.0-RC.3 eliminates this vulnerability. Productinfo Type Content Management System Vendor Chamilo Name LMS Version 2.0-RC.0 2.0-RC.1 2.0-RC.2 License open-source CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.6 VulDB Meta Temp Score: 7.4 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.8 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Privileges management CWE: CWE-269 / CWE-266 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: LMS 2.0-RC.3 Timelineinfo 04/10/2026 CVE reserved 04/15/2026 +5 days Advisory disclosed 04/15/2026 +0 days VulDB entry created 04/15/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Confirmed CVE: CVE-2026-40291 (🔒) GCVE (CVE): GCVE-0-2026-40291 GCVE (VulDB): GCVE-100-357653 Entryinfo Created: 04/15/2026 07:18 Changes: 04/15/2026 07:18 (65) Complete: 🔍 Cache ID: 99:D70:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸