source: https://www.securityfocus.com/bid/57465/info

Classified Ultra is prone to an SQL-injection vulnerability and a cross-site scripting vulnerability because it fails to sufficiently sanitize user-supplied data.

Exploiting these vulnerabilities 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. 

SQL-injection:

http://www.example.com/demos/classifiedultra/subclass.php?c=16'[SQLi HERE]

Cross-site scripting:

http://www.example.com/demos/classifiedultra/subclass.php?c=6&cname=Credit%20Cards[XSS HERE]