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Over 21,000 unpatched Exchange servers expose critical SYSTEM-level flaw

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A critical security vulnerability in Microsoft Exchange servers allows attackers to bypass authentication and achieve SYSTEM-level remote code execution. The flaw, tracked as CVE-2026-62911, affects Exchange Server 2016, 2019, and SE versions. In September 2026, over 21,800 internet-facing servers remained unpatched, primarily in the United States and Germany. While fixes exist for supported versions, many servers, especially outdated ones, lack a straightforward update path. Security experts recommend immediate patching or restricting internet access to the vulnerable MRSProxy component.

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Over 21,000 unpatched Exchange servers expose critical SYSTEM-level flaw · ShortSingh