Add Local Avatar <= 12.1 - Cross-Site Request Forgery via manage_avatar_cache

Description

The Add Local Avatar plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 12.1. This is due to missing or incorrect nonce validation on the manage_avatar_cache function. This makes it possible for unauthenticated attackers to manage avatars on the site via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.