The Contest Gallery WordPress plugin before 19.1.5.1, Contest Gallery Pro WordPress plugin before 19.1.5.1 do not escape the option_id POST parameter before concatenating it to an SQL query in order-custom-fields-with-and-without-search.php. This may allow malicious users with at least author privilege to leak sensitive information from the site's database.
https://wpscan.com/vulnerability/d5d39138-a216-46cd-9e5f-fc706a2c93da