WP Spell Check <= 9.17 is vulnerable to Cross Site Request Forgery (CSRF) vulnerability

The WP Spell Check plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 9.17. This is due to missing or incorrect nonce validation on the wpscx_admin_empty_render() function. This makes it possible for unauthenticated attackers to update an API key via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.