The EWWW Image Optimizer plugin for WordPress was found to have a security vulnerability in versions up to, and including, 5.8.1. This vulnerability, known as a Cross-Site Request Forgery, was caused by the ewww_ngg_bulk_init() function not having the right security measures in place. This made it possible for unauthenticated attackers to use tricks to get a site administrator to take an action like clicking on a link, and then use this action to do an unauthorized bulk image optimization.