EUVD-2025-209408CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
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Description
Chamilo LMS is a learning management system. From 1.11.0 to 2.0-beta.1, anyone can trigger a malicious redirect through the use of the redirect parameter to /login. This vulnerability is fixed in 2.0-beta.2.
Analysis
Open redirect vulnerability in Chamilo LMS login endpoint allows unauthenticated remote attackers to redirect users to arbitrary external websites via the redirect parameter, affecting versions 1.11.0 through 2.0-beta.1. The vulnerability was patched in 2.0-beta.2 and subsequent releases. No public exploit code or active exploitation has been confirmed, but the attack requires no authentication or special complexity and could be weaponized for phishing campaigns.
Technical Context
Chamilo LMS is an open-source learning management system. The vulnerability resides in the login functionality at the /login endpoint, specifically in improper validation of the redirect parameter (CWE-601: URL Redirection to Untrusted Site). The affected versions (1.11.0 to 2.0-beta.1) fail to sanitize or validate the redirect parameter before performing server-side redirects, allowing attackers to inject arbitrary URLs. This is a classic open redirect vulnerability where user-supplied input is used directly in HTTP redirection logic without allowlisting or validation. The CPE identifier cpe:2.3:a:chamilo:chamilo-lms indicates all variants of the Chamilo LMS product across all platforms and configurations within the vulnerable version range are affected.
Affected Products
Chamilo LMS versions 1.11.0 through 2.0-beta.1 are affected per the GitHub security advisory (GHSA-m82x-prv3-rwwv). ENISA further specifies that the vulnerability impacts chamilo-lms 1.11.0 and all versions below 2.0.0-RC.3. The CPE cpe:2.3:a:chamilo:chamilo-lms:*:*:*:*:*:*:*:* indicates the vulnerability affects all variants of the product. Users running any version in the 1.11.x branch or early 2.0 beta releases should be considered at risk. Consult the GitHub security advisory for complete version mapping.
Remediation
Vendor-released patch: upgrade to Chamilo LMS 2.0-beta.2 or later, with ENISA confirming safety in version 2.0.0-RC.3 and beyond. The upstream fix is confirmed in commit 73ae6293adaa6098374bc22625342dbae5cbc446 which implements proper validation of the redirect parameter. Organizations unable to upgrade immediately should implement network-level controls such as restricting login redirects to internal domains only, or review and restrict the use of the redirect parameter at the web application firewall level. Refer to the GitHub security advisory at https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-m82x-prv3-rwwv and the fix commit at https://github.com/chamilo/chamilo-lms/commit/73ae6293adaa6098374bc22625342dbae5cbc446 for implementation details.
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