WP To Do <= 1.3.0 - Cross-Site Request Forgery via wptodo_settings

The WP To Do plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.3.0. This is due to missing or incorrect nonce validation on the wptodo_settings() 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.