Popup box <= 4.1.2 - Cross-Site Request Forgery

The Popup box plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 4.1.2. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.