phpbb 3.0.x-3.0.6 has an XSS vulnerability via the [flash] BB tag.
Cross-site request forgery (CSRF) vulnerability in privmsg.php in phpBB 2.0.22 allows remote attackers to delete private messages (PM) as arbitrary users via a deleteall action.
Missing form token validation in phpBB 3.2.7 allows CSRF in deleting post attachments.
phpBB version 3.2.7 allows the stealing of an Administration Control Panel session id by leveraging CSRF in the Remote Avatar feature. The CSRF Token Hijacking leads to stored XSS
phpBB 3.2.8 allows a CSRF attack that can approve pending group memberships.
phpBB 3.2.8 allows a CSRF attack that can modify a group avatar.
Cross-site scripting (XSS) vulnerability in includes/startup.php in phpBB before 3.0.13 allows remote attackers to inject arbitrary web script or HTML via vectors related to "Relative Path Overwrite."
Cross-site scripting (XSS) vulnerability in search.php in phpBB 2.0.3 and possibly earlier versions allows remote attackers to inject arbitrary web script or HTML via the search_username parameter in searchuser mode.