DX Sources <= 2.0.1 - Cross-Site Request Forgery to Settings Update

The DX Sources plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.0.1. This is due to missing or incorrect nonce validation on the settings_page_build function. This makes it possible for unauthenticated attackers to trick a logged-in administrator into submitting a forged request that modifies the plugin's configuration options via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.