The Responsive Tabs WordPress plugin before 4.0.7 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/ea2a8420-4b0e-4efb-a0c6-ceea996dae5a/