Copyscape Premium <= 1.3.8 - Cross-Site Request Forgery

The Copyscape Premium plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.3.8. This is due to missing or incorrect nonce validation on the copyscape_post() function. This makes it possible for unauthenticated attackers to update plugin settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.