The WP Tabs WordPress plugin before 2.1.17 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/3834a162-2cdc-41e9-9c9d-2b576eed4db9