Leaky Paywall < 4.21.3 - Cross-Site Request Forgery

Description

The Leaky Paywall plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 4.21.2. This is due to missing or incorrect nonce validation on the process_level_deleted function. This makes it possible for unauthenticated attackers to modify plugin settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.