Strange Problem

[Danecookie]

Well, some users are using cheap hacking techniques to hack the front page of my forums. Like i get many hits per day, and many of them use html codes in the new thread "Title" area.. many of the peoples i got, did that and they were not sucessful, i just removed the thread.

But yesterday a guy placed an html code in a new thread in my General Section and it worked, and due to that my front page started to get redirected to > http://srsrxxx.kayyo.com/

Is this a flaw in vb? or what should i do to avoid this?

Thanks [i am using vB 3.6.0]