The Loginizer plugin before 1.6.4 for WordPress allows SQL injection (with resultant XSS), related to loginizer_login_failed and lz_valid_ip.
https://wpscan.com/vulnerability/10441
https://wpdeeply.com/loginizer-before-1-6-4-sqli-injection/
https://plugins.trac.wordpress.org/changeset/2401010/loginizer