Directory traversal vulnerability in the XCloner plugin 3.1.1 for WordPress and 3.5.1 for Joomla! allows remote administrators to read arbitrary files via a .. (dot dot) in the file parameter in a json_return action in the xcloner_show page to wp-admin/admin-ajax.php.
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.