True Ranker <= 2.2.9 - Cross-Site Request Forgery to Unauthorized True Ranker Disconnection

The True Ranker plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.2.9. This is due to missing nonce validation on the seolocalrank-signout action. This makes it possible for unauthenticated attackers to disconnect the administrator's True Ranker account via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.