Categorify <= 1.0.7.4 - Cross-Site Request Forgery via categorifyAjaxAddCategory

The Categorify plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.0.7.4. This is due to missing or incorrect nonce validation on the categorifyAjaxAddCategory function. This makes it possible for unauthenticated attackers to add categories via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.