Windows Server 2019 build 17763.9121 (KB5120238) — release notes, known issues

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• Coverage CVE-2026-62714: Windows DHCP Server Information Disclosure Vulnerability Sep 8, 2026 · names this build
• Coverage CVE-2026-62720: Windows DHCP Server Information Disclosure Vulnerability Sep 8, 2026 · names this build
• Coverage CVE-2026-71331: Windows Device Health Attestation (DHA) Remote Code Execution Vulnerability Aug 20, 2026 · names this build
• Coverage CVE-2026-65791: Windows iSCSI Target Service Remote Code Execution Vulnerability Aug 18, 2026 · names this build
• Fix CVE-2026-62912 Exchange DoS: 2016/2019 Require ESU to Patch Aug 11, 2026 · Windows Server 2019 coverage from this build's release window
• Coverage CVE-2019-1068, AjaxPro RCEs Added to CISA KEV Catalog Aug 26, 2026 · Windows Server 2019 coverage from this build's release window
• Coverage Exchange Online Raises the Bar for Exchange 2016 and 2019 Sep 2, 2026 · Windows Server 2019 coverage from this build's release window

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