CVE-2026-34602— Chamilo LMS: IDOR in /api/course_rel_users Allows Unauthorized Enrollment of Arbitrary Users into Courses
Quick assessment
Affected
chamilo chamilo-lms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Chamilo LMS是Chamilo开源的一套开源的在线学习和协作系统。该系统支持创建教学内容、远程培训和在线答题等。 Chamilo LMS 2.0.0-RC.3之前版本存在安全漏洞，该漏洞源于/api/course_rel_users端点存在不安全的直接对象引用漏洞，可能导致经过身份验证的攻击者修改请求体中的用户参数，在未经适当授权检查的情况下将任意用户注册到任何课程中。
Possible ATT&CK Techniques 3 AI
T1548 · Abuse Elevation Control Mechanism T1078 · Valid Accounts T1136 · Create Account
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I. Basic Information for CVE-2026-34602
Vulnerability Information
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Vulnerability Title
Chamilo LMS: IDOR in /api/course_rel_users Allows Unauthorized Enrollment of Arbitrary Users into Courses
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Chamilo LMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Chamilo LMS是Chamilo开源的一套开源的在线学习和协作系统。该系统支持创建教学内容、远程培训和在线答题等。 Chamilo LMS 2.0.0-RC.3之前版本存在安全漏洞，该漏洞源于/api/course_rel_users端点存在不安全的直接对象引用漏洞，可能导致经过身份验证的攻击者修改请求体中的用户参数，在未经适当授权检查的情况下将任意用户注册到任何课程中。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| chamilo | chamilo-lms | < 2.0.0-RC.3 | - |
|
II. Public POCs for CVE-2026-34602
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-34602 (2)
Vendor Advisories for CVE-2026-34602 (1)
Same Patch Batch · chamilo · 2026-04-14 · 8 CVEs total
| CVE-2026-35196 | 8.8 HIGH | Chamilo LMS has OS Command Injection via export_all_certificates action |
| CVE-2026-40291 | 8.8 HIGH | Chamilo LMS has Privilege Escalation via API User Role Modification |
| CVE-2026-34160 | 8.6 HIGH | Chamilo LMS: Unauthenticated SSRF via PENS Plugin allows attacker to probe internal networ |
| CVE-2026-33715 | 7.2 HIGH | Chamilo LMS has Unauthenticated SSRF and Open Email Relay via install.ajax.php test_mailer |
| CVE-2026-34370 | 6.5 MEDIUM | Chamilo LMS: IDOR in the Notebook Module allows an attacker to view other users' private n |
| CVE-2026-34161 | Chamilo LMS: Stored XSS via Malicious File Upload in Social Post Attachments Leads to Arbi | |
| CVE-2026-33714 | Chamilo LMS has Authenticated SQL Injection in statistics.ajax.php users_active action (2. |
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V. Comments for CVE-2026-34602
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