The Meteor Slides WordPress plugin before 1.5.7 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/d0afd17c-09cd-4ab5-95a5-6ac8c3c0a50b