WP Contact Form <= 1.6 - Cross-Site Request Forgery via wpcf_adminpage

Description

The WP Contact Form plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.6. This is due to missing or incorrect nonce validation on the 'wpcf_adminpage' function. This makes it possible for unauthenticated attackers to modify the plugin's settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.