GiveWP <= 2.25.1 is vulnerable to Cross Site Request Forgery (CSRF) via give_cache_flush vulnerability

The GiveWP plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.25.1. This is due to missing or incorrect nonce validation on the 'give_cache_flush' AJAX function. This makes it possible for unauthenticated attackers to flush the GiveWP cache via forged request granted they can trick a site administrator into performing an action such as clicking on a link.