Endless Posts Navigation <= 2.2.7 is vulnerable to CSRF to Stored XSS vulnerability

The Endless Posts Navigation plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.2.7. This is due to missing or incorrect nonce validation in the epn_settings.php file. This makes it possible for unauthenticated attackers to update plugin settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.