PHP remote file inclusion vulnerability in quick_reply.php for phpBB Advanced Quick Reply Hack 1.0.0 and 1.1.0 allows remote attackers to execute arbitrary PHP code via the phpbb_root_path parameter.
phpBB 2.0 through 2.0.3 generates names for uploaded avatar files with the hex-encoded IP address of the client system, which allows remote attackers to obtain client IP addresses.
prefs.php in phpBB 1.4.0 and earlier allows remote authenticated users to execute arbitrary PHP code via an invalid language value, which prevents the variables (1) $l_statsblock in prefs.php or (2) $l_privnotify in auth.php from being properly initialized, which can be modified by the user and later used in an eval statement.