Chamilo LMS: Unauthenticated access to internal email settings

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7.2

Chamilo LMS: Unauthenticated access to internal email settings

CVE-2026-33715

Summary

An attacker can access and control email settings without a password, potentially allowing them to send spam emails from the server and reveal internal network information. This issue has been fixed in version 2.0.0-RC.3. Ensure you are running the latest version of Chamilo LMS to stay secure.

Original title

Original description

Chamilo LMS is an open-source learning management system. In version 2.0-RC.2, the file public/main/inc/ajax/install.ajax.php is accessible without authentication on fully installed instances because, unlike other AJAX endpoints, it does not include the global.inc.php file that performs authentication and installation-completed checks. Its test_mailer action accepts an arbitrary Symfony Mailer DSN string from POST data and uses it to connect to an attacker-specified SMTP server, enabling Server-Side Request Forgery (SSRF) into internal networks via the SMTP protocol. An unauthenticated attacker can also abuse this to weaponize the Chamilo server as an open email relay for phishing and spam campaigns, with emails appearing to originate from the server's IP address. Additionally, error responses from failed SMTP connections may disclose information about internal network topology and running services. This issue has been fixed in version 2.0.0-RC.3.

nvd CVSS3.1 7.2

Vulnerability type

CWE-306 Missing Authentication for Critical Function

CWE-918 Server-Side Request Forgery (SSRF)

Published: 14 Apr 2026 · Updated: 14 Apr 2026 · First seen: 14 Apr 2026