[Opserty]

Have you got modifications installed on your board? I recommend you disable them as soon as possible, one of them have a severe security exploit which could be harmful to you board. If you downloaded the modifications from here at vBulletin you should check the modification threads to see if security exploits have been found. (Normally those with exploits are either updated and/or placed in the Modification Graveyard here at vB.org)

I also recommend you create a back up of your database immediately if this exploit is used it is possible that you could lose your board. If all your modifications are secure (once you've checked them against the threads) PM a list of the ones you have installed.