Directory traversal vulnerability in wp-admin/admin.php in the DMSGuestbook 1.8.0 and 1.7.0 plugin for WordPress allows remote authenticated users to read arbitrary files via a .. (dot dot) in the (1) folder and (2) file parameters.
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.