External Links <= 2.57 - Cross-Site Request Forgery via action_admin_action_wpel_dismiss_notice

The External Links plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.5.7. This is due to missing or incorrect nonce validation on the 'action_admin_action_wpel_dismiss_notice' function. This makes it possible for unauthenticated attackers to dismiss the plugin's admin notifications via forged request granted they can trick a site administrator into performing an action such as clicking on a link.