The Infographic Maker WordPress plugin before 4.3.8 does not validate and escape the post_id parameter before using it in a SQL statement via the qcld_upvote_action AJAX action (available to unauthenticated and authenticated users), leading to an unauthenticated SQL Injection
https://wpscan.com/vulnerability/a8575322-c2cf-486a-9c37-71a22167aac3