iSupport 1.8 - 'index.php?which' Cross-Site Scripting

source: https://www.securityfocus.com/bid/37380/info
 
iDevSpot iSupport is prone to multiple cross-site scripting vulnerabilities because the application fails to sufficiently sanitize user-supplied input
 
An attacker may leverage these issues to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may allow the attacker to steal cookie-based authentication credentials and to launch other attacks.
 
iSupport 1.8 and prior versions are vulnerable.

http://www.example.com/helpdesk/index.php?include_file=knowledgebase_list.php&x_category=PARENT_CATEGORY&which=%3Cscript%3Ealert%28/XSS/.source%29%3C/script%3E