The WP Video Lightbox WordPress plugin before 1.9.7 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 admin.
https://wpscan.com/vulnerability/28abe589-1371-4ed2-90b6-2bb96c93832c