Sign-up Sheets < 2.2.12 - Cross-Site Request Forgery

Description

The Sign-up Sheets plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.2.11.1. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to perform an unauthorized action via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.