The WordPress Infinite Scroll WordPress plugin before 5.6.0.3 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/497d0bf9-b750-4293-9662-1722a74442e2