The WP MediaTagger WordPress plugin through 4.1.1 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/03f51b54-0ec2-40ce-a0fa-ef0c4ab0ea99/