Directory traversal vulnerability in contrib/phpBB2/modules.php in Gallery 1.5.7 and 1.6-alpha3, when register_globals is enabled, allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the phpEx parameter within a modload action.
Improper Limitation of a Pathname to a Restricted Directory The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.