WP Sliding Login/Dashboard Panel <= 2.1.1 - Cross-Site Request Forgery to Settings Update

The WP Sliding Login/Dashboard Panel plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.1.1. This is due to missing or incorrect nonce validation on the wp_sliding_panel_user_options() function. 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.