Cross-site scripting (XSS) vulnerability in the private message box implementation (privmsg.php) in phpBB 2.0.x allows remote authenticated users to inject arbitrary web script or HTML via the "Message body" field in a message to a non-existent user.
Cross-site request forgery (CSRF) vulnerability in urlobox in MKPortal allows remote attackers to delete arbitrary messages as an administrator via a delete operation in an img BBcode tag.