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CVE-2026-20839— Windows Client-Side Caching (CSC) Service Information Disclosure Vulnerability

CVSS 5.5 · Medium EPSS 0.04% · P11
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I. Basic Information for CVE-2026-20839

Vulnerability Information
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Vulnerability Title
Windows Client-Side Caching (CSC) Service Information Disclosure Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
Improper access control in Windows Client-Side Caching (CSC) Service allows an authorized attacker to disclose information locally.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
访问控制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Microsoft Windows CSC Service 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows CSC Service是美国微软（Microsoft）公司的一个应用程序。允许在本地计算机脱机时使用网络文件。 Microsoft Windows CSC Service存在访问控制错误漏洞。攻击者利用该漏洞可以获取敏感信息。以下产品和版本受到影响：Windows 10 Version 1809 for 32-bit Systems,Windows 10 Version 1809 for x64-based Systems,Windows Server 2019,Win
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

VendorProductAffected VersionsCPESubscribe
MicrosoftWindows 10 Version 1607 10.0.14393.0 ~ 10.0.14393.8783 -
MicrosoftWindows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.8276 -
MicrosoftWindows 10 Version 21H2 10.0.19044.0 ~ 10.0.19044.6809 -
MicrosoftWindows 10 Version 22H2 10.0.19045.0 ~ 10.0.19045.6809 -
MicrosoftWindows 11 version 22H3 10.0.22631.0 ~ 10.0.22631.6491 -
MicrosoftWindows 11 Version 23H2 10.0.22631.0 ~ 10.0.22631.6491 -
MicrosoftWindows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.7623 -
MicrosoftWindows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.7623 -
MicrosoftWindows Server 2008 R2 Service Pack 1 6.1.7601.0 ~ 6.1.7601.28117 -
MicrosoftWindows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 ~ 6.1.7601.28117 -
MicrosoftWindows Server 2012 6.2.9200.0 ~ 6.2.9200.25868 -
MicrosoftWindows Server 2012 (Server Core installation) 6.2.9200.0 ~ 6.2.9200.25868 -
MicrosoftWindows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.22968 -
MicrosoftWindows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.22968 -
MicrosoftWindows Server 2016 10.0.14393.0 ~ 10.0.14393.8783 -
MicrosoftWindows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.8783 -
MicrosoftWindows Server 2019 10.0.17763.0 ~ 10.0.17763.8276 -
MicrosoftWindows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.8276 -
MicrosoftWindows Server 2022 10.0.20348.0 ~ 10.0.20348.4648 -
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 ~ 10.0.25398.2092 -
MicrosoftWindows Server 2025 10.0.26100.0 ~ 10.0.26100.32230 -
MicrosoftWindows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.32230 -

II. Public POCs for CVE-2026-20839

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III. Intelligence Information for CVE-2026-20839

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

CVE-2026-209639.8 CRITICALMicrosoft SharePoint Remote Code Execution Vulnerability
CVE-2026-209478.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-208688.8 HIGHWindows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
CVE-2026-209528.4 HIGHMicrosoft Office Remote Code Execution Vulnerability
CVE-2026-209448.4 HIGHMicrosoft Word Remote Code Execution Vulnerability
CVE-2026-209538.4 HIGHMicrosoft Office Remote Code Execution Vulnerability
CVE-2026-208568.1 HIGHWindows Server Update Service (WSUS) Remote Code Execution Vulnerability
CVE-2026-209318.0 HIGHWindows Telephony Service Elevation of Privilege Vulnerability
CVE-2026-208327.8 HIGHWindows Remote Procedure Call Interface Definition Language (IDL) Elevation of Privilege V
CVE-2026-209247.8 HIGHWindows Management Services Elevation of Privilege Vulnerability
CVE-2026-209227.8 HIGHWindows NTFS Remote Code Execution Vulnerability
CVE-2026-208437.8 HIGHWindows Routing and Remote Access Service (RRAS) Elevation of Privilege Vulnerability
CVE-2026-209207.8 HIGHWin32k Elevation of Privilege Vulnerability
CVE-2026-208377.8 HIGHWindows Media Remote Code Execution Vulnerability
CVE-2026-212247.8 HIGHAzure Connected Machine Agent Elevation of Privilege Vulnerability
CVE-2026-208407.8 HIGHWindows NTFS Remote Code Execution Vulnerability
CVE-2026-209567.8 HIGHMicrosoft Excel Remote Code Execution Vulnerability
CVE-2026-208777.8 HIGHWindows Management Services Elevation of Privilege Vulnerability
CVE-2026-209517.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-209467.8 HIGHMicrosoft Excel Remote Code Execution Vulnerability

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

IV. Related Vulnerabilities

Same product: Windows 10 Version 1607
Same vendor: Microsoft
Same weakness: CWE-284

V. Comments for CVE-2026-20839

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