An issue was discovered in the VeronaLabs wp-statistics plugin before 12.6.7 for WordPress. The v1/hit endpoint of the API, when the non-default "use cache plugin" setting is enabled, is vulnerable to unauthenticated blind SQL Injection.
https://wpvulndb.com/vulnerabilities/9412
https://wordpress.org/plugins/wp-statistics/#developers
https://github.com/wp-statistics/wp-statistics/commit/bd46721b97794a1b1520e24ff5023b6da738dd75