An XSS issue was discovered in Wing FTP 6.4.4. An arbitrary IFRAME element can be included in the help pages via a crafted link, leading to the execution of (sandboxed) arbitrary HTML and JavaScript in the user's browser.
https://www.wftpserver.com/serverhistory.htm
https://wshenk.blogspot.com/2021/01/xss-in-wing-ftps-web-interface-cve-2020.html