Easy Chat Server, in its 3.1 version and before, does not sufficiently encrypt user-controlled inputs, resulting in a Cross-Site Scripting (XSS) vulnerability stored via /registresult.htm (POST method), in the Resume parameter. The XSS is loaded from /register.ghp.
https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-efs-software-products