Ninja Forms < 3.8.7 - Cross-Site Request Forgery

Description

The Ninja Forms plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.8.6. This is due to missing or incorrect nonce validation on the submit_listener() function. This makes it possible for unauthenticated attackers to update license details via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.