There was a flaw in the WordPress plugin, Email Subscribers & Newsletters before 4.3.1, that allowed SQL statements to be passed to the database in the hash parameter (a blind SQL injection vulnerability).Referenceshttps://wpvulndb.com/vulnerabilities/9947https://www.wordfence.com/blog/2019/11/multiple-vulnerabilities-patched-in-email-subscribers-newsletters-plugin/http://packetstormsecurity.com/files/158568/WordPress-Email-Subscribers-And-Newsletters-4.2.2-SQL-Injection.html
