onsiteisite.com XSS vulnerability

Vulnerable URL: http://www.onsiteisite.com/page32620/Login.aspx?msg=access%20denied.%20please%20login%20to%20view%20the%20requested%20page."--!"=e=%2Fpage31905%2Fon-site-wastewater-course-downloads.aspx Details: Description| Value ---|--- Patched:| No Latest check for patch:| 29.07.2017...