source: https://www.securityfocus.com/bid/13639/info

MetaCart e-Shop is prone to a cross-site scripting vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input.

An attacker may leverage this issue to have arbitrary script code executed in the browser of an unsuspecting user. This may facilitate the theft of cookie-based authentication credentials as well as other attacks. 

http://www.example.com/mcartlite/productsByCategory.asp?intCatalogID=1&strCatalog_NAME=<script>alert('test')</script>