The Insert Pages WordPress plugin before 3.7.5 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/a1786400-dc62-489c-b986-ba17c9833179