Nearly 22,000 Microsoft Exchange servers remain unpatched against CVE-2026-62911, a critical authentication bypass vulnerability, according to daily scans from the Shadowserver Foundation. The United States and Germany top the list with 6,200 and 5,100 unpatched servers. CVE-2026-62911 is a critical severity vulnerability, and Microsoft describes it as “authentication bypass by capture-replay in Microsoft Exchange Server,” which allows an authorized attacker to elevate privileges over a network. Microsoft released the fix on August 11, 2026, and … More →
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