[toonysnn]

To debug this, in config.php add under <?php

PHP Code:

define("DISABLE_HOOKS", true); 


If this fixes the problem, remove this and disable your plugins one by one to find the security flaw.

If it is yet to be fixed, you'll need to do a check on the plugins created under the product, "vBulletin." Sometimes some users' will try to create a plugin here.

Check the template "FORUMHOME" as well.