Multiple cross-site scripting (XSS) vulnerabilities in Photo Album 2.0.53 module for phpBB allow remote attackers to inject arbitrary web script or HTML via the bsid parameter to (1) album_cat.php or (2) album_comment.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.