Multiple cross-site scripting (XSS) vulnerabilities in phpBB 2.0.14 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) u parameter to profile.php, (2) highlight parameter to viewtopic.php, or (3) forumname or forumdesc parameters to admin_forums.php.
Meilad File upload script (up.php) mod for phpBB 2.0.x does not properly limit the types of files that can be uploaded, which allows remote authenticated users to execute arbitrary commands by uploading PHP files, then directly requesting them from the uploads directory.
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 2.0.11, and possibly other versions, with remote avatars and avatar uploading enabled, allows local users to read arbitrary files by providing both a local and remote location for an avatar, then modifying the "Upload Avatar from a URL:" field to reference the target file.
viewtopic.php in phpBB 2.0.12 and earlier allows remote attackers to obtain sensitive information via a highlight parameter containing invalid regular expression syntax, which reveals the path in a PHP error message.
PHP remote file inclusion vulnerability in admin_cash.php for the Cash Mod module for phpBB allows remote attackers to execute arbitrary PHP code by modifying the phpbb_root_path parameter to reference a URL on a remote web server that contains the code.
viewtopic.php in phpBB 2.x before 2.0.11 improperly URL decodes the highlight parameter when extracting words and phrases to highlight, which allows remote attackers to execute arbitrary PHP code by double-encoding the highlight value so that special characters are inserted into the result, which is then processed by PHP exec, as exploited by the Santy.A worm.