The Search & Filter WordPress plugin before 1.2.16 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 admin.
https://wpscan.com/vulnerability/54168861-c0b8-4de6-a9af-0ad5c20b4a45