mhs.ch XSS vulnerability

Vulnerable URL: http://mhs.ch/sendsite.php?page=http://mhs.ch/download?datei=KuendigungsformularANDERETelefonInternet-AnschlussTV-Anschluss201206.pd=ayy%22%3E%3Cscript%3Ealert%22OPENBUGBOUNTY%22;%3C/script%3E Details: Description| Value ---|--- Patched:| No Latest check for patch:| 06.12.2017...