source: https://www.securityfocus.com/bid/24063/info

HLstats is prone to mulitiple cross-site scripting vulnerabilities because the application fails to sufficiently sanitize user-supplied data.

Exploiting these issues may help an attacker steal cookie-based authentication credentials and launch other attacks.

HLstats 1.35 is vulnerable; other versions may also be affected. 

http://www.example.com/hlstats/hlstats.php/>"><script>alert(1)</script> http://www.example.com/hlstats/hlstats.php?action=[xss]