My main suggestion would be to make sure you have the most updated version of Vbulletin.
There are tons of way especially when we start looking at third party modules/scripts loaded on your instance of Vbuletin.
It doesn't sound to me like your interested in how hackers get past conventional security methods, your just interested in Vbulletin, a list of known exploits can be found at packet storm (just google for packet storm + vbulletin + exploit)
These are exploits which specifically target Vbulletin, it won't be of much use anywhere else, unless you take the core of what the exploits are doing and adjust/update it to form a new, more relevant exploit.
If you can provide the community with the version you are currently running they might be of better assistance?
For your own site's safety I'm going to recommend that you don't post the URL of your site, with the version where we are discussing possible security risks, google does index these posts and someone with less good intentions might stumble upon it.
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