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CVE-2026-20940— Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Quick assessment

Affected
Microsoft Windows 10 Version 1607
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows Cloud Files Mini Filter Driver是美国微软（Microsoft）公司的一款云文件过滤器驱动程序。 Microsoft Windows Cloud Files Mini Filter Driver存在安全漏洞。攻击者利用该漏洞可以提升权限。以下产品和版本受到影响：Windows Server 2008 R2 for x64-based Systems Service Pack 1,Windows Server 2008 for x64-base

CVSS 7.8 · High EPSS 0.47% · P39

Affected Version Matrix 19

VendorProduct Version RangeStatus
Microsoft Windows 10 Version 1607 10.0.14393.0< 10.0.14393.8783 affected
Microsoft Windows 10 Version 1809 10.0.17763.0< 10.0.17763.8276 affected
Microsoft Windows 10 Version 21H2 10.0.19044.0< 10.0.19044.6809 affected
Microsoft Windows 10 Version 22H2 10.0.19045.0< 10.0.19045.6809 affected
Microsoft Windows 11 version 23H2 10.0.22631.0< 10.0.22631.6491 affected
Microsoft Windows 11 Version 23H2 10.0.22631.0< 10.0.22631.6491 affected
Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.0< 6.1.7601.28117 affected
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0< 6.1.7601.28117 affected
Microsoft Windows Server 2008 Service Pack 2 6.0.6003.0< 6.0.6003.23717 affected
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0< 6.0.6003.23717 affected
Microsoft Windows Server 2012 6.2.9200.0< 6.2.9200.25868 affected
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0< 6.2.9200.25868 affected
Microsoft Windows Server 2012 R2 6.3.9600.0< 6.3.9600.22968 affected
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0< 6.3.9600.22968 affected
Microsoft Windows Server 2016 10.0.14393.0< 10.0.14393.8783 affected
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0< 10.0.14393.8783 affected
Microsoft Windows Server 2019 10.0.17763.0< 10.0.17763.8276 affected
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0< 10.0.17763.8276 affected
Microsoft Windows Server 2022 10.0.20348.0< 10.0.20348.4648 affected
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I. Basic Information for CVE-2026-20940

Vulnerability Information
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Vulnerability Title
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Heap-based buffer overflow in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
非可信指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Cloud Files Mini Filter Driver 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Cloud Files Mini Filter Driver是美国微软（Microsoft）公司的一款云文件过滤器驱动程序。 Microsoft Windows Cloud Files Mini Filter Driver存在安全漏洞。攻击者利用该漏洞可以提升权限。以下产品和版本受到影响：Windows Server 2008 R2 for x64-based Systems Service Pack 1,Windows Server 2008 for x64-base
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Windows 10 Version 1607 10.0.14393.0 ~ 10.0.14393.8783 -
Microsoft Windows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.8276 -
Microsoft Windows 10 Version 21H2 10.0.19044.0 ~ 10.0.19044.6809 -
Microsoft Windows 10 Version 22H2 10.0.19045.0 ~ 10.0.19045.6809 -
Microsoft Windows 11 version 23H2 10.0.22631.0 ~ 10.0.22631.6491 -
Microsoft Windows 11 Version 23H2 10.0.22631.0 ~ 10.0.22631.6491 -
Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.0 ~ 6.1.7601.28117 -
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 ~ 6.1.7601.28117 -
Microsoft Windows Server 2008 Service Pack 2 6.0.6003.0 ~ 6.0.6003.23717 -
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0 ~ 6.0.6003.23717 -
Microsoft Windows Server 2012 6.2.9200.0 ~ 6.2.9200.25868 -
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0 ~ 6.2.9200.25868 -
Microsoft Windows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.22968 -
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.22968 -
Microsoft Windows Server 2016 10.0.14393.0 ~ 10.0.14393.8783 -
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.8783 -
Microsoft Windows Server 2019 10.0.17763.0 ~ 10.0.17763.8276 -
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.8276 -
Microsoft Windows Server 2022 10.0.20348.0 ~ 10.0.20348.4648 -

II. Public POCs for CVE-2026-20940

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III. Intelligence Information for CVE-2026-20940

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Same Patch Batch · Microsoft · 2026-01-13 · 112 CVEs total

CVE-2026-20963 9.8 CRITICAL Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2026-20947 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-20868 8.8 HIGH Windows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2026-20952 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2026-20944 8.4 HIGH Microsoft Word Remote Code Execution Vulnerability
CVE-2026-20953 8.4 HIGH Microsoft Office Remote Code Execution Vulnerability
CVE-2026-20856 8.1 HIGH Windows Server Update Service (WSUS) Remote Code Execution Vulnerability
CVE-2026-20931 8.0 HIGH Windows Telephony Service Elevation of Privilege Vulnerability
CVE-2026-20859 7.8 HIGH Windows Kernel-Mode Driver Elevation of Privilege Vulnerability
CVE-2026-21224 7.8 HIGH Azure Connected Machine Agent Elevation of Privilege Vulnerability
CVE-2026-20837 7.8 HIGH Windows Media Remote Code Execution Vulnerability
CVE-2026-20956 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-20840 7.8 HIGH Windows NTFS Remote Code Execution Vulnerability
CVE-2026-20955 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-20951 7.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-20946 7.8 HIGH Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-20857 7.8 HIGH Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
CVE-2026-20920 7.8 HIGH Win32k Elevation of Privilege Vulnerability
CVE-2026-20918 7.8 HIGH Windows Management Services Elevation of Privilege Vulnerability
CVE-2026-20923 7.8 HIGH Windows Management Services Elevation of Privilege Vulnerability

Showing top 20 of 112 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows 10 Version 1607
Same vendor: Microsoft
Same weakness: CWE-822

V. Comments for CVE-2026-20940

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