In WS_FTP Server versions prior to 8.7.4 and 8.8.2, a reflected cross-site scripting (XSS) vulnerability exists in WS_FTP Server's Ad Hoc Transfer module. An attacker could leverage this vulnerability to target WS_FTP Server users with a specialized payload which results in the execution of malicious JavaScript within the context of the victims browser.
https://www.progress.com/ws_ftp
https://community.progress.com/s/article/WS-FTP-Server-Critical-Vulnerability-September-2023