Two days ago another highly critical security update affected WordPress maintenance support plans and many other CMS systems. It was the PHPMailer Library which leaves millions of websites vulnerable to the remote exploit (see https://www.WordPress.org/psa-2020-004 for details). In comparison to WordPress maintenance support plansgeddon which had a risk of 25/25 this update has 23/25. BUT there are some things which make this update even riskier than WordPress maintenance support plansgeddon:
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