RapidLoad Power-Up for Autoptimize <= 1.7.1 - Cross-Site Request Forgery via 'ucss_connect'

The RapidLoad Power-Up for Autoptimize plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.7.1. This is due to missing or incorrect nonce validation on the ucss_connect function. This makes it possible for unauthenticated attackers to connect the site to a new license key via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.