Server-Side Request Forgery (SSRF) in Chamilo LMS - CVE-2026-33715
Published: April 24, 2026
Vulnerability identifier: #VU127573
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N]
CVE-ID: CVE-2026-33715
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform server-side request forgery and send emails to attacker-specified destinations.
The vulnerability exists due to missing authentication for critical function in public/main/inc/ajax/install.ajax.php test_mailer action when processing a user-supplied Symfony Mailer DSN from POST data. A remote attacker can send a specially crafted request to perform server-side request forgery and send emails to attacker-specified destinations.
The affected endpoint remains accessible on fully installed instances because it does not include the authentication and installation-completed checks performed by global.inc.php.
Affected software
Chamilo LMS
How to mitigate CVE-2026-33715
Install security update from vendor's website.
Chamilo LMS - update to 2.0.0 RC.3