The Brizy WordPress plugin before 2.8.19 does not properly restrict who can modify its site-global design data and does not sanitise part of that data before outputting it, allowing authenticated users with Author-level access and above to store arbitrary JavaScript that is then served unsanitised on the site's front-end pages and executes in the browser of every visitor, including administrators.
https://wpscan.com/vulnerability/e5eecbc1-1e6b-4915-9b42-869219db8ea6/