source: http://www.securityfocus.com/bid/45079/info

4homepages 4images is prone to an SQL-injection vulnerability because the application fails to properly sanitize user-supplied input before using it in an SQL query.

A successful exploit could allow an attacker to compromise the application, access or modify data, or exploit vulnerabilities in the underlying database. 

http://www.example.com/4images/categories.php?cat_id=1&page=-2999+%27%29+union/ 