The YouTube Embed, Playlist and Popup by WpDevArt WordPress plugin before 2.3.9 did not escape, validate or sanitise some of its shortcode options, available to users with a role as low as Contributor, leading to an authenticated Stored Cross-Site Scripting issue.
https://wpscan.com/vulnerability/531b3fac-48b9-4821-a3aa-4db073d43aae