The WPB Advanced FAQ WordPress plugin through 1.0.6 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/4f5597f9-ab27-42d2-847c-14455b7d0849