Windows Server 2022 build 20348.4893 (KB5078766) — release notes, known issues

• Issue Known issue After installing KB5070884 or later updates, Windows Server Update Services (WSUS) does not display synchronization error details within its error reporting. This functionality is temporarily removed to address the Remote Code Execution Vulnerability, CVE-2025-59287 .

Microsoft's release notes for KB5078766 ›

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• Issue Microsoft Fixes Windows Server Upgrade Bug: 2019/2022 No Longer Auto-Route to 2025 Apr 15, 2026 · Windows Server 2022 coverage from this build's release window
• Issue Microsoft Fixes Windows Server 2019/2022 Bug That Could Offer Server 2025 Apr 16, 2026 · Windows Server 2022 coverage from this build's release window
• Fix KB5082063 LSASS Reboot Loops: Microsoft Out-of-Band Fixes for Server 2025/2022 Apr 20, 2026 · Windows Server 2022 coverage from this build's release window

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