The WP-DownloadManager plugin for WordPress is vulnerable to arbitrary file read in all versions up to, and including, 1.68.10. This is due to a lack of restriction on the directory an administrator can select for storing downloads. This makes it possible for authenticated attackers, with Administrator-level access and above, to download and read any file on the server, including system and configuration files.
https://plugins.trac.wordpress.org/changeset/3294467/
https://plugins.trac.wordpress.org/browser/wp-downloadmanager/trunk/download-options.php#L42
https://plugins.trac.wordpress.org/browser/wp-downloadmanager/trunk/download-options.php#L16