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CVE-2026-33703— Chamilo LMS Critical IDOR: Any Authenticated User Can Extract All Users’ Personal Data and API Tokens

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/social-network/personal-data/{userId}端点存在不安全的直接对象引用，可能导致任何经过身份验证的用户访问任意用户的完整个人数据和API令牌。

AI Predicted 8.1 Difficulty: Easy EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-33703

Vulnerability Information
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Vulnerability Title
Chamilo LMS Critical IDOR: Any Authenticated User Can Extract All Users’ Personal Data and API Tokens
Source: CVE Program / CVE List V5
Vulnerability Description
Chamilo LMS is a learning management system. Prior to 2.0.0-RC.3, an Insecure Direct Object Reference (IDOR) vulnerability in the /social-network/personal-data/{userId} endpoint allows any authenticated user to access full personal data and API tokens of arbitrary users by modifying the userId parameter. This results in mass disclosure of sensitive user information and credentials, enabling a full platform data breach. This vulnerability is fixed in 2.0.0-RC.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA: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/social-network/personal-data/{userId}端点存在不安全的直接对象引用，可能导致任何经过身份验证的用户访问任意用户的完整个人数据和API令牌。
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-2026-33703

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III. Intelligence Information for CVE-2026-33703

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Vendor Advisories for CVE-2026-33703 (1)

Same Patch Batch · chamilo · 2026-04-10 · 23 CVEs total

CVE-2026-33707 9.4 CRITICAL Weak Password Recovery Mechanism for Forgotten Password in chamilo/chamilo-lms
CVE-2026-32892 9.1 CRITICAL OS Command Injection in Chamilo LMS 1.11.36
CVE-2026-33618 8.8 HIGH Chamilo LMS Affected by Remote Code Execution via eval() in Platform Settings
CVE-2026-31939 8.3 HIGH Path Traversal (Arbitrary File Delete) in Chamilo LMS
CVE-2026-31941 7.7 HIGH Server-Side Request Forgery (SSRF) in Chamilo LMS
CVE-2026-32931 7.5 HIGH Chamilo LMS has Arbitrary File Upload via MIME-Only Validation in Exercise Sound Upload Le
CVE-2026-31940 7.5 HIGH Session Fixation in Chamilo LMS
CVE-2026-33710 7.5 HIGH Chamilo LMS has Weak REST API Key Generation (Predictable)
CVE-2026-32930 7.1 HIGH Chamilo LMS has an IDOR in Gradebook Allows Cross-Course Evaluation Edit Without Ownership
CVE-2026-32894 7.1 HIGH Chamilo LMS has an IDOR in Gradebook Allows Cross-Course Deletion of Any Student's Grade R
CVE-2026-33706 7.1 HIGH Chamilo LMS has a REST API Self-Privilege Escalation (Student → Teacher)
CVE-2026-33704 7.1 HIGH Chamilo LMS Affected by Authenticated Arbitrary File Write via BigUpload endpoint
CVE-2026-33702 7.1 HIGH Chamilo LMS has an Insecure Direct Object Reference (IDOR)
CVE-2026-33708 6.5 MEDIUM Chamilo LMS has REST API PII Exposure via get_user_info_from_username
CVE-2026-33141 6.5 MEDIUM Chamilo LMS has an IDOR in REST API Stats Endpoint Exposes Any User's Learning Data
CVE-2026-33736 6.5 MEDIUM Chamilo LMS has an Insecure Direct Object Reference (IDOR) - User Data Exposure
CVE-2026-32893 5.4 MEDIUM Chamilo LMS has Reflected XSS via Unsanitized http_build_query() in Exercise Question List
CVE-2026-33705 5.3 MEDIUM Chamilo LMS has unauthenticated access to Twig template source files exposes application l
CVE-2026-33737 5.3 MEDIUM Chamilo LMS has an XML External Entity (XXE) Injection
CVE-2026-32932 4.7 MEDIUM Chamilo LMS has an Open Redirect via Unvalidated 'page' Parameter in Session Course Edit

Showing top 20 of 23 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: chamilo-lms
Same vendor: chamilo
Same weakness: CWE-639

V. Comments for CVE-2026-33703

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