The Unlimited Elements for Elementor WordPress plugin before 2.0.21 does not escape an icon value before concatenating it into an HTML attribute in its shared widget-parameter processor, allowing users with Contributor access (who do not hold unfiltered_html) to store a payload that executes when the page is rendered.
https://wpscan.com/vulnerability/1d488c84-2797-4c02-8c13-54b80e4128dc/