Themify Portfolio Post WordPress plugin before 1.1.7 does not sanitise and escape the num_of_pages parameter before outputting it back the response of the themify_create_popup_page_pagination AJAX action (available to any authenticated user), leading to a Reflected Cross-Site Scripting
https://wpscan.com/vulnerability/bbc0b812-7b30-4ab4-bac8-27c706b3f146