I haven't liked vBulletin for some time now and mostly put that forum software behind me except for the occasional jab about how bad their software is. I came across this interesting update from PC Gamer the other day... with a part that I emphasized:
http://www.pcgamer.com/2013/07/26/why-forums-and-comments-are-still-offline/
http://mos.futurenet.com/forum/
I don't visit PC Gamer's website, so I'm not certain what version of vB they were using, but this is pretty huge. The took all of their entire network's vBulletin powered forums offline because it was exploited.
Well PC Gamer, I suggest you switch to Invision Power.
vBulletin has really gone downhill and I'm glad we stopped using their software when we did.