blackgum.com.au XSS vulnerability

Vulnerable URL: https://blackgum.com.au/scripts/searchbasic.php?isbn="--!"=====$0.00=$0.00=Submit+SearchKNOXSS Details: Description| Value ---|--- Patched:| No Latest check for patch:| 31.07.2017 Vulnerability type:| XSS Vulnerability status:| Publicly disclosed Alexa Rank| Unknown / Not calculat...