Cross-site request forgery (CSRF) vulnerability in phpBB 2.0.19, when Link to off-site Avatar or bbcode (IMG) are enabled, allows remote attackers to perform unauthorized actions as a logged in user via a link or IMG tag in a user profile, as demonstrated using links to (1) admin/admin_users.php and (2) modcp.php.
A "missing request validation" error in phpBB 2 before 2.0.18 allows remote attackers to edit private messages of other users, probably by modifying certain parameters or other inputs.
Multiple SQL injection vulnerabilities in phpbb-Auction allow remote attackers to execute arbitrary SQL commands via the (1) u parameter to auction_rating.php or (2) ar parameter to action_offer.php.
Directory traversal vulnerability in (1) usercp_register.php and (2) usercp_avatar.php for phpBB 2.0.11, and possibly other versions, with gallery avatars enabled, allows remote attackers to delete (unlink) arbitrary files via "/../" sequences in the avatarselect parameter.
phpBB 2.0.8a and earlier trusts the IP address that is in the X-Forwarded-For in the HTTP header, which allows remote attackers to spoof IP addresses.
install.php in phpBB 2.0 through 2.0.1, when "allow_url_fopen" and "register_globals" variables are set to "on", allows remote attackers to execute arbitrary PHP code by modifying the phpbb_root_dir parameter to reference a URL on a remote web server that contains the code.