source: http://www.securityfocus.com/bid/26587/info

FMDeluxe is prone to a cross-site scripting vulnerability because it fails to sufficiently sanitize user-supplied data.

Exploiting this issue allows an attacker to execute arbitrary HTML or script code in a user's browser session in the context of an affected site. This may allow the attacker to steal cookie-based authentication credentials and launch other attacks.

This issue affects FMDeluxe 2.1.0; other versions may also be affected. 

http://www.example.com/PATH/index.php?action=category&id=[XSS]