Technically speaking no forum software is hundred percent secure, new exploits are always discovered by hackers and are exploited quite alot before the developers fix it. I dont agree with csgal on one thing when she says VB code is difficult for hackers to obtain because pirated copies of VB are found all over the web. A simple search on google and you can get it. At the end of the day its the development that counts, VB and IPB are rapidly developing softwares thus security holes are sealed over and over as compared to open source like phpbb which hasnt really been developed much.