Booking Calendar Contact Form <= 1.2.34 - Cross-Site Request Forgery via cpdexbccf_feedback

The Booking Calendar Contact Form plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.2.34. This is due to missing or incorrect nonce validation on the cpdexbccf_feedback function called via the cpdexbccf_feedback AJAX action. This makes it possible for unauthenticated attackers to perform an unauthorized feedback form submission via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.