January 24, 2026—KB5078135 (OS Build 26100.32236) Out-of-band

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January 24, 2026—KB5078136 (OS Build 20348.4651) Out-of-band

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January 24, 2026—KB5078133 (OS Build 25398.2097) Out-of-band

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Microsoft Windows SMB Server Elevation of Privilege Vulnerability (CNVD-2026-10681)

Microsoft Windows SMB Server is a network file-sharing protocol from Microsoft. It allows applications on a computer to read and write files and request services from server programs on a computer network. An elevation of privilege vulnerability exists in Microsoft Windows SMB Server, which can b...

Microsoft Windows SMB Server Elevation of Privilege Vulnerability (CNVD-2026-10677)

Microsoft Windows SMB Server is a network file-sharing protocol from Microsoft. It allows applications on a computer to read and write files and request services from server programs on a computer network. An elevation of privilege vulnerability exists in Microsoft Windows SMB Server due to...

January 17, 2026—KB5077792 (OS Build 25398.2096) Out-of-band

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January 17, 2026—KB5077793 (OS Build 26100.32234) Out-of-band

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January 17, 2026—KB5077795 (OS Build 17763.8280) Out-of-band

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January 17, 2026—KB5077800 (OS Build 20348.4650) Out-of-band

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Exploit for Deserialization of Untrusted Data in Microsoft

WSUS Security Research Toolkit !Pythonhttps://img.shields...

CVE-2026-20927

Concurrent execution using shared resource with improper synchronization 'race condition' in Windows SMB Server allows an authorized attacker to deny service over a network...

CVE-2026-20856

Improper input validation in Windows Server Update Service allows an unauthorized attacker to execute code over a network...

CVE-2026-20934

Concurrent execution using shared resource with improper synchronization 'race condition' in Windows SMB Server allows an authorized attacker to elevate privileges over a network...

CVE-2026-20934

Concurrent execution using shared resource with improper synchronization 'race condition' in Windows SMB Server allows an authorized attacker to elevate privileges over a network...

CVE-2026-20926

Concurrent execution using shared resource with improper synchronization 'race condition' in Windows SMB Server allows an authorized attacker to elevate privileges over a network...

CVE-2026-20927

Concurrent execution using shared resource with improper synchronization 'race condition' in Windows SMB Server allows an authorized attacker to deny service over a network...

CVE-2026-20921

Concurrent execution using shared resource with improper synchronization 'race condition' in Windows SMB Server allows an authorized attacker to elevate privileges over a network...

CVE-2026-20848

Concurrent execution using shared resource with improper synchronization 'race condition' in Windows SMB Server allows an authorized attacker to elevate privileges over a network...

2026-01 Cumulative Update for Microsoft server operating system version 21H2 for x64-based Systems (KB5073457)

Install this update to resolve issues in Windows. For a complete listing of the issues that are included in this update, see the associated Microsoft Knowledge Base article for more information. After you install this item, you may have to restart your computer...

2026-01 Cumulative Update for Windows Server 2019 for x64-based Systems (KB5073723)

A security issue has been identified in a Microsoft software product that could affect your system. You can help protect your system by installing this update from Microsoft. For a complete listing of the issues that are included in this update, see the associated Microsoft Knowledge Base article...