The ShiftNav WordPress plugin before 1.7.2 does not validate and escape some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripting attacks which could be used against high privilege users such as admins.
https://wpscan.com/vulnerability/be9e8870-0682-441d-8955-d096d1346bd1