source: https://www.securityfocus.com/bid/13462/info
  
ViArt Shop is affected by multiple cross-site scripting and HTML injection vulnerabilities. These issues are due to a failure in the application to properly sanitize user-supplied input before using it in dynamically generated content.
  
Attacker-supplied HTML and script code would be able to access properties of the site, potentially allowing for theft of cookie-based authentication credentials. An attacker could also exploit this issue to control how the site is rendered to the user; other attacks are also possible.
  
These issues are reported to affect ViArt Shop Enterprise version 2.1.6; other versions may also be vulnerable. 

http://www.example.com/reviews.php?category_id=0&item_id=4[XSS-CODE]
http://www.example.com/reviews.php?category_id=0[XSS-CODE]&item_id=4
http://www.example.com/reviews.php?filter=0&item_id=4[XSS-CODE]&category_id=0