Popup Builder by OptinMonster – WordPress Popups for Optins, Email Newsletters and Lead Generation <= 2.15.3 - Cross-Site Request Forgery to Notice Dismissal

The OptinMonster plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.15.3. This is due to missing or incorrect nonce validation on the validate_please_connect_notice_dismiss() function. This makes it possible for unauthenticated attackers to dismiss notices via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.