CVE-2023-3545: Chamilo

Critical severity, CVSS 9.8. EPSS: 2.4% chance of exploitation in the next 30 days.

Improper sanitisation in `main/inc/lib/fileUpload.lib.php` in Chamilo LMS <= v1.11.20 on Windows and Apache installations allows unauthenticated attackers to bypass file upload security protections and obtain remote code execution via uploading of `.htaccess` file. This vulnerability may be exploited by privileged attackers or chained with unauthenticated arbitrary file write vulnerabilities, such as CVE-2023-3533, to achieve remote code execution.

Affected products

• Chamilo Chamilo: up to and including 1.11.20

Published 2023-11-28. Last modified 2026-06-17.