The ProSolution WP Client WordPress plugin before 2.0.11 does not sanitise and escape a parameter before reflecting it into an HTML attribute on one of its administrative pages, leading to reflected Cross-Site Scripting that runs in the session of an administrator induced to submit a crafted request.
https://wpscan.com/vulnerability/83ad2038-3755-40a5-a8af-e6fac94341d1/