Contact Form 7 Calendar <= 3.0.1 is vulnerable to CSRF to Stored XSS vulnerability

The Contact Form 7 Calendar plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 3.0.1. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to update settings and 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.