source: https://www.securityfocus.com/bid/13499/info

FishCart is prone to multiple cross-site scripting and SQL-injection vulnerabilities because the application fails to properly sanitize user-supplied input.

A successful exploit of the SQL-injection issues could allow an attacker to compromise the application, access or modify data, or exploit vulnerabilities in the underlying database implementation.

An attacker may leverage the cross-site scripting issues to execute arbitrary script code in the browser of an unsuspecting user. This may help the attacker steal cookie-based authentication credentials and launch other attacks. 

http://www.example.com/demo31/display.php?cartid=200505024231092&zid=1&lid=1&nlst='"><script>alert(document.cookie)</script>&olimit=0&cat=&key1=&psku=