The Newsletter2Go plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'resetStyles' AJAX action in all versions up to, and including, 4.0.14. This makes it possible for authenticated attackers, with Subscriber-level access and above, to reset styles.
https://plugins.trac.wordpress.org/browser/newsletter2go/trunk/gui/N2Go_Gui.php#L294