The Meta Box plugin before 4.16.3 for WordPress allows file deletion via ajax, with the wp-admin/admin-ajax.php?action=rwmb_delete_file attachment_id parameter.Referenceshttps://metabox.io/changelog/https://www.pluginvulnerabilities.com/2019/02/01/full-disclosure-of-authenticated-arbitrary-file-deletion-vulnerability-in-wordpress-plugin-with-300000-installs/
