Pearl <= 1.3.9 is vulnerable to Cross Site Request Forgery (CSRF) vulnerability

The WordPress Header Builder Plugin – Pearl plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.3.9. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to perform an unauthorized action granted they can trick a site administrator into performing an action such as clicking on a link.