Custom User CSS <= 0.2 is vulnerable to Settings Update via CSRF vulnerability

The Custom User CSS plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 0.2. This is due to missing or incorrect nonce validation. This makes it possible for unauthenticated attackers to update plugin settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.