Participants Database <= 2.4.5 is vulnerable to Cross Site Request Forgery (CSRF)

The Participants Database plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.4.5. This is due to missing nonce validation on the process_request function. This makes it possible for unauthenticated attackers to modify participant lists via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.