The theplus_more_post AJAX action of The Plus Addons for Elementor Page Builder WordPress plugin before 4.1.12 did not properly sanitise some of its fields, leading to a reflected Cross-Site Scripting (exploitable on both unauthenticated and authenticated users)
https://wpscan.com/vulnerability/2ee62f85-7aea-4b7d-8b2d-5d86d9fb8016