The Falang multilanguage for WordPress plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on several functions in all versions up to, and including, 1.3.52. This makes it possible for authenticated attackers, with Subscriber-level access and above, to update and delete translations and expose the administrator email address.
https://plugins.trac.wordpress.org/changeset/3131499/
https://plugins.trac.wordpress.org/browser/falang/trunk/admin/class-falang-admin.php