phpBB 2.0.21 does not properly handle pathnames ending in %00, which allows remote authenticated administrative users to upload arbitrary files, as demonstrated by a query to admin/admin_board.php with an avatar_path parameter ending in .php%00.

usercp_avatar.php in PHPBB 2.0.20, when avatar uploading is enabled, allows remote attackers to use the server as a web proxy by submitting a URL to the avatarurl parameter, which is then used in an HTTP GET request.

SQL injection vulnerability in bb_memberlist.php for phpBB 1.4.2 allows remote attackers to execute arbitrary SQL queries via the $sortby variable.

db.php in phpBB 2.0 (aka phpBB2) RC-3 and earlier allows remote attackers to execute arbitrary code from remote servers via the phpbb_root_path parameter.

Cross-site scripting vulnerability in phpBB 1.4.4 and earlier allows remote attackers to execute arbitrary Javascript on web clients by embedding the script within an IMG image tag while editing a message.

phpBB 1.4.4 and earlier with BBcode allows remote attackers to cause a denial of service (CPU consumption) and corrupt the database via null \0 characters within [code] tags.

Cross-site scripting vulnerability in phpBB 2.0.0 (phpBB2) allows remote attackers to execute Javascript as other phpBB users by including a http:// and a double-quote (") in the [IMG] tag, which bypasses phpBB's security check, terminates the src parameter of the resulting HTML IMG tag, and injects the script.

admin_ug_auth.php in phpBB 2.0.0 allows local users to gain administrator privileges by directly calling admin_ug_auth.php with modifed form fields such as "u".

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.

Cross-site scripting (XSS) vulnerability in viewtopic.php in phpBB 2.0.3 allows remote attackers to inject arbitrary web script or HTML via the highlight parameter.

SQL injection vulnerability in Gender MOD 1.1.3 allows remote attackers to gain administrative access via the user_level parameter in the User Profile page.

Cross-site scripting (XSS) vulnerability in viewtopic.php for phpBB allows remote attackers to insert arbitrary web script via the topic_id parameter.