WP OAuth Server <= 4.2.3 - Cross-Site Request Forgery to Arbitrary Post Deletion (wo_ajax_remove_client)

The WP OAuth Server plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 4.2.3. This is due to missing or incorrect nonce validation on the wo_ajax_remove_clientfunction. This makes it possible for unauthenticated attackers to delete arbitrary posts, via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.