Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Chamilo | Chamilo Lms | 2.0.0 |
Related Weaknesses (CWE)
References
- https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.0-RC.3ProductRelease Notes
- https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-mxc9-9335-45mcVendor Advisory
FAQ
What is CVE-2026-33715?
CVE-2026-33715 is a vulnerability with a CVSS score of 7.2 (HIGH). 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,...
How severe is CVE-2026-33715?
CVE-2026-33715 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33715?
Check the references section above for vendor advisories and patch information. Affected products include: Chamilo Chamilo Lms.