The WP-DownloadManager plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the download-add.php file in all versions up to, and including, 1.68.11. This makes it possible for authenticated attackers, with Administrator-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.
https://wordpress.org/plugins/wp-downloadmanager/
https://plugins.trac.wordpress.org/browser/wp-downloadmanager/trunk/download-add.php#L35