The Contest Gallery WordPress plugin before 19.1.5.1, Contest Gallery Pro WordPress plugin before 19.1.5.1 do not escape the addCountS POST parameter before concatenating it to an SQL query in 4_activate.php. This may allow malicious users with at least author privilege to leak sensitive information from the site's database.
https://wpscan.com/vulnerability/6e7de2bb-5f71-4c27-ae79-4f6b2ba7f86f