Redirection for Contact Form 7 < 2.3.4 - Unprotected AJAX Actions

In the Redirection for Contact Form 7 WordPress plugin before 2.3.4, any authenticated user, such as a subscriber, could use the various AJAX actions in the plugin to do a variety of things. For example, an attacker could use wpcf7r_reset_settings to reset the plugin’s settings, wpcf7r_add_action to add actions to a form, and more.