source: http://www.securityfocus.com/bid/55592/info

VBulletin is prone to an SQL-injection vulnerability because it fails to sufficiently sanitize user-supplied data before using it in an SQL query.

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

VBulletin 4.1.12 is vulnerable; other versions may also be affected. 

http://www.example.com/includes/blog_plugin_useradmin.php?do=usercss&amp;u=[Sql]