Allaire Forums 2.0.4 and 2.0.5 and Forums! 3.0 and 3.1 allows remote authenticated users to spoof messages as other users by modifying the hidden form fields for the name and e-mail address.
Allaire Forums 2.0.5 allows remote attackers to bypass access restrictions to secure conferences via the rightAccessAllForums or rightModerateAllForums variables.