An unrestricted file upload vulnerability exists in Dell (acquired by Quest) KACE K1000 System Management Appliance version 5.0 - 5.3, 5.4 prior to 5.4.76849, and 5.5 prior to 5.5.90547 in the download_agent.php endpoint. An attacker can upload arbitrary PHP files to a temporary web-accessible directory, which are later executed through inclusion in backend code that loads files under attacker-controlled paths.