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).
https://www.wordfence.com/blog/2019/11/multiple-vulnerabilities-patched-in-email-subscribers-newsletters-plugin/
https://wpvulndb.com/vulnerabilities/9947
http://packetstormsecurity.com/files/158568/WordPress-Email-Subscribers-And-Newsletters-4.2.2-SQL-Injection.html
Source: Mitre, NVD
Published: 2020-01-08
Updated: 2026-06-17
Base Score: 7.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
Severity: High
Base Score: 9.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: Critical
EPSS: 0.8511