The Wbcom Designs – Custom Font Uploader plugin for WordPress is vulnerable to unauthorized loss of data due to a missing capability check on the 'cfu_delete_customfont' function in all versions up to, and including, 2.3.4. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete any custom font.
https://plugins.trac.wordpress.org/changeset/3097373/
https://plugins.trac.wordpress.org/browser/custom-font-uploader/trunk/inc/cfup-functions.php#L20