(As far as I know) If you have enabled
html codes in the forum, then there is a risk of cookie exploit.
Hacker can include code in a reply/post, capture and send cookie data to a external server etc.
If so, re-install vb + restore from the last known good MySQL backup + change Admin password + Go to Admin Control panel ---> Forum & Moderators ---> Forum Manager ---> disable HTML.
Although the hacker cannot find the password, it is better to inform all other members to change the password immediately.
From vb FAQ,
Quote:
Allow HTML Code in posts
This allows users to use HTML while posting. It is strongly recommended that you DO NOT turn this on as it can severely compromise security and/or severely mess up layout if users insert malformed HTML
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Also, MySQL should always be running for the proper functionality of the site. It is back end storage medium
Hope it helps