The issue allows unauthenticated attackers to perform stored cross-site scripting attacks and obtain remote code execution via uploading of web shell, specifically through the big file upload functionality in `/main/inc/lib/javascript/bigupload/inc/bigUpload.php`. This has been exploited in real-world incidents, such as the PermX machine on HackTheBox, where attackers used subdomain enumeration to discover a vulnerable Chamilo LMS instance, and then abused a bash script with sudo privileges to gain root access.