https://blog.nintechnet.com/multiple-wordpress-plugins-vulnerable-to-html-injection/
https://www.wordfence.com/threat-intel/vulnerabilities/id/b3af900c-4048-4f4f-93e9-c60ca34d015b?source=cve
https://plugins.svn.wordpress.org/wp-html-mail/trunk/readme.txt
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