The Exertio Framework plugin for WordPress is vulnerable to privilege escalation via account takeover in all versions up to, and including, 1.3.1. This is due to the plugin not properly validating a users identity prior to updating their password through the fl_forgot_pass_new() function. This makes it possible for unauthenticated attackers to change arbitrary users passwords, including administrators, and leverage that to gain access to their account.
When setting a new password for a user, the product does not require knowledge of the original password, or using another form of authentication.