The WP MultiTasking WordPress plugin through 0.1.12 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/34ae6121-304f-495b-bcc1-4fbd3d70a9fb/