GoKawiil21,899 Exchange servers still unpatched against CVE-2026-62911 flaw
Shadowserver has identified nearly 22,000 internet-exposed Microsoft Exchange servers that remain unpatched against CVE-2026-62911, a high-severity authentication bypass flaw affecting Exchange Server 2016, 2019, and Subscription Edition. Most vulnerable systems are located in the United States and Germany, where officials say roughly 85% of on-premises Exchange servers remain exposed despite Microsoft releasing a fix in August 2026.