Directory traversal vulnerability in Gallery 2.0.3 and earlier, and 2.1 before RC-2a, allows remote attackers to include arbitrary PHP files via ".." (dot dot) sequences in the stepOrder parameter to (1) upgrade/index.php or (2) install/index.php.

Gallery 2 up to 2.0.2 allows remote attackers to spoof their IP address via a modified X-Forwarded-For (XFORWARDEDFOR) HTTP header, which is checked by Gallery before other more reliable sources of IP address information, such as REMOTEADDR.

Directory traversal vulnerability in the session handling class (GallerySession.class) in Gallery 2 up to 2.0.2 allows remote attackers to access and delete files by specifying the session in a cookie, which is used in constructing file paths before the session value is sanitized.

Cross-site scripting (XSS) vulnerability in Gallery 2 up to 2.0.2 allows remote attackers to inject arbitrary web script or HTML via the X-Forwarded-For (XFORWARDEDFOR) HTTP header, which is not properly handled when adding a comment to an album.