Path traversal in file upload functionality in `/main/webservices/additional_webservices.php` in Chamilo LMS <= v1.11.20 allows unauthenticated attackers to perform stored cross-site scripting attacks and obtain remote code execution via arbitrary file write.CreditsNgo Wei Lin (@Creastery) of STAR Labs SG Pte. Ltd. (@starlabs_sg)Referenceshttps://support.chamilo.org/projects/chamilo-18/wiki/security_issues#Issue-124-2023-07-13-Critical-impact-High-risk-Unauthenticated-Arbitrary-File-Write-RCE-CVE-2023-3533https://starlabs.sg/advisories/23/23-3533/https://github.com/chamilo/chamilo-lms/commit/37be9ce7243a30259047dd4517c48ff8b21d657a
