The online bulletin board phpBB (php Bulletin Board) was taken offline on Sunday, following a security breach that allowed access to user account details. phpBB is an open-source software package used to run discussion forums on web sites. The breach was caused when the attacker gained access through an unpatched security bug in PHPlist, a third-party open source email application, used for managing newsletters. The attacker had access for more than two weeks before the breach was discovered.
Thanks to Brian Honan for the links.