https://www.wordfence.com/threat-intel/vulnerabilities/id/28f77d5a-fc17-4e17-85b9-4e6f66dbf2c7?source=cve
https://plugins.trac.wordpress.org/browser/gtm-server-side/tags/2.1.19/templates/class-gtm-server-side-admin.php#L30
https://plugins.trac.wordpress.org/changeset/3158847/gtm-server-side/tags/2.1.20/templates/class-gtm-server-side-admin.php
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