CVE-2026-34602 | Chamilo LMS up to 2.0.0-RC.2 /api/course_rel_users authorization

VDB-357597 · CVE-2026-34602 · GCVE-0-2026-34602 CHAMILO LMS UP TO 2.0.0-RC.2 /API/COURSE_REL_USERS AUTHORIZATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.5 $0-$5k 1.86+ Summaryinfo A vulnerability identified as critical has been detected in Chamilo LMS up to 2.0.0-RC.2. This impacts an unknown function of the file /api/course_rel_users. Performing a manipulation results in authorization. This vulnerability is reported as CVE-2026-34602. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component. Detailsinfo A vulnerability classified as critical has been found in Chamilo LMS up to 2.0.0-RC.2. This affects some unknown functionality of the file /api/course_rel_users. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. This is going to have an impact on 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, 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. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-34602 since 03/30/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. Upgrading to version 2.0.0-RC.3 eliminates this vulnerability. Productinfo Type Content Management System Vendor Chamilo Name LMS Version 2.0.0-RC.0 2.0.0-RC.1 2.0.0-RC.2 License open-source CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.7 VulDB Meta Temp Score: 6.5 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.1 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: Authorization CWE: CWE-639 / CWE-285 / 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 2.0.0-RC.3 Timelineinfo 03/30/2026 CVE reserved 04/14/2026 +15 days Advisory disclosed 04/14/2026 +0 days VulDB entry created 04/14/2026 +0 days VulDB entry last update Sourcesinfo Advisory: github.com Status: Confirmed CVE: CVE-2026-34602 (🔒) GCVE (CVE): GCVE-0-2026-34602 GCVE (VulDB): GCVE-100-357597 Entryinfo Created: 04/14/2026 23:56 Changes: 04/14/2026 23:56 (64) Complete: 🔍 Cache ID: 99:72C:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸