I actually did. It took me less than 1 minute. But I was thinking about making one to post in thread like this one since a while and now I just did.

Going back to the subject imho vbulletin especially old vb3 is very secure software. Assuming that one cares about basic system security like weak permissions or control panel and other unnecessary for end user files access then vb is really hard nut to crack. Saying: "vBulletin very easy to hacked " without any fact/proof is just silly babbling. But that's not the reason I did it, the reason I posted above was to induce the OP to post some proofs if he has any... but I really really doubt he has any or that he even knows anything about the web security at all.

Oh and I would like to point that there are some really controversial/unwanted/tempting (for some people) sites powered by vb and many would like to hack them but yet that sites stand still there like solid rocks. So ..yeah.