The NEX-Forms WordPress plugin before 8.3.3 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/047b50c0-0eb3-4371-9e5d-3778fdafc66b