Progress Sitefinity 9.1 has XSS via file upload, because JavaScript code in an HTML file has the same origin as the application's own code. This is fixed in 10.1.Referenceshttps://www.sec-consult.com/en/blog/advisories/multiple-vulnerabilities-in-progress-sitefinity/index.htmlhttps://packetstormsecurity.com/files/143894/Progress-Sitefinity-9.1-XSS-Session-Management-Open-Redirect.html