The Magee Shortcodes WordPress plugin through 2.1.1 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.
https://wpscan.com/vulnerability/02928db8-ceb3-471a-b626-ca661d073e4f