Chamilo LMS up to 2.0-RC.2 AJAX Endpoint global.inc.php test_mailer missing authentication

Summaryinfo

A vulnerability was found in Chamilo LMS up to 2.0-RC.2. It has been rated as critical. This issue affects the function test_mailer of the file global.inc.php of the component AJAX Endpoint. The manipulation leads to missing authentication. This vulnerability is documented as CVE-2026-33715. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Chamilo LMS up to 2.0-RC.2. This issue affects the function test_mailer of the file global.inc.php of the component AJAX Endpoint. The manipulation with an unknown input leads to a missing authentication vulnerability. Using CWE to declare the problem leads to CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-33715 since 03/23/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

By approaching the search of inurl:global.inc.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.0-RC.3 eliminates this vulnerability. The upgrade is hosted for download at github.com.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Content Management System

Vendor

• Chamilo

Name

• LMS

Version

• 2.0-RC.0
• 2.0-RC.1
• 2.0-RC.2

License

• open-source

CPE 2.3info

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CPE 2.2info

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