source: http://www.securityfocus.com/bid/14872/info
 
vBulletin is prone to multiple SQL injection vulnerabilities. These issues are due to a failure in the application to properly sanitize user-supplied input before using it in SQL queries.
 
Successful exploitation could result in a compromise of the application, disclosure or modification of data, or may permit an attacker to exploit vulnerabilities in the underlying database implementation.

> /admincp/user.php:
GET: <do=find&orderby=username&limitnumber=[SQL-Injection]>
GET: <do=find&orderby=username&limitstart=[SQL-Injection]>