SEO Redirection Plugin – 301 Redirect Manager <= 8.9 - Cross-Site Request Forgery

The SEO Redirection Plugin – 301 Redirect Manager plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 8.9. This is due to missing nonce validation in the ~/options/option_page_404.php and ~/options/option_page_history.php files. This makes it possible for unauthenticated attackers to delete 404 redirects via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.