FreeWebShop 2.1/2.2 - 'index.php?cat' Cross-Site Scripting

source: https://www.securityfocus.com/bid/20969/info
 
FreeWebShop is prone to multiple input-validation vulnerabilities, including a cross-site scripting issue and a local file-include issue.
 
An attacker can exploit these issues to view files, execute local scripts, steal cookie-based authentication credentials, and launch other attacks.
 
FreeWebShop 2.2 and prior versions are vulnerable to these issues.

http://www.freewebshop.org/demo/index.php?page=browse&action=list&group=8&cat=[xss]