RapidLoad Power-Up for Autoptimize <= 1.7.1 - Missing Authorization in 'ucss_connect'

The RapidLoad Power-Up for Autoptimize plugin for WordPress is vulnerable to unauthorized plugin settings update due to a missing capability check on the ucss_connect function in versions up to, and including, 1.7.1. This makes it possible for authenticated attackers with subscriber-level access to connect a new license key to the site.