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Microsoft Exchange Vulnerability CVE-2026-62911: What Administrators Should Do and ...
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Fusion42 · 4 September 2026 · Fusion42 review
Microsoft Exchange servers running versions 2016, 2019, and Subscription Edition are vulnerable to a high-severity authentication bypass (CVE-2026-62911) that allows attackers to control mailboxes. Over 22,000 servers remain unpatched and exposed globally, with exploit code already public, urging immediate patching or internal-only access and recommending zero trust solutions to remove internet exposure.
This Wire brief sits within Fusion42's coverage of Cybersecurity, and 2 sources have reported it between 1 Sep 2026 and 4 Sep 2026.
◆ ◆ The Wire takeaway
Your Exchange server’s mailbox security has just become an urgent firefight. Stop exposing it to the internet now or your customers’ data becomes an open book to attackers racing to exploit AI-accelerated vulnerabilities.
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2 sources · first reported 1 Sep 2026 · latest 4 Sep 2026
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