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CVE-2026-20931— Windows Telephony Service Elevation of Privilege Vulnerability

CVSS 8.0 · High EPSS 0.79% · P74
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I. Basic Information for CVE-2026-20931

Vulnerability Information
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Vulnerability Title
Windows Telephony Service Elevation of Privilege Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
文件名或路径的外部可控制
Source: NVD (National Vulnerability Database)
Vulnerability Title
Microsoft Windows Telephony Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Telephony Server是美国微软（Microsoft）公司的一个组件，它支持电话应用程序编程接口（TAPI），允许计算机程序与共享的电话服务进行通信。 Microsoft Windows Telephony Server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 10 Version 1809 for 32-bit Systems,Windows 10 Version 1809 for x64-based Systems
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 2008 Service Pack 2 6.0.6003.0 ~ 6.0.6003.23717 -
MicrosoftWindows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0 ~ 6.0.6003.23717 -
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-2026-20931

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III. Intelligence Information for CVE-2026-20931

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

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CVE-2026-209528.4 HIGHMicrosoft Office Remote Code Execution Vulnerability
CVE-2026-209538.4 HIGHMicrosoft Office Remote Code Execution Vulnerability
CVE-2026-209448.4 HIGHMicrosoft Word Remote Code Execution Vulnerability
CVE-2026-208568.1 HIGHWindows Server Update Service (WSUS) Remote Code Execution Vulnerability
CVE-2026-208587.8 HIGHWindows Management Services Elevation of Privilege Vulnerability
CVE-2026-212247.8 HIGHAzure Connected Machine Agent Elevation of Privilege Vulnerability
CVE-2026-208377.8 HIGHWindows Media Remote Code Execution Vulnerability
CVE-2026-209567.8 HIGHMicrosoft Excel Remote Code Execution Vulnerability
CVE-2026-209557.8 HIGHMicrosoft Excel Remote Code Execution Vulnerability
CVE-2026-208407.8 HIGHWindows NTFS Remote Code Execution Vulnerability
CVE-2026-209517.8 HIGHMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-209467.8 HIGHMicrosoft Excel Remote Code Execution Vulnerability
CVE-2026-208577.8 HIGHWindows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability
CVE-2026-209187.8 HIGHWindows Management Services Elevation of Privilege Vulnerability
CVE-2026-209237.8 HIGHWindows Management Services Elevation of Privilege Vulnerability
CVE-2026-209207.8 HIGHWin32k Elevation of Privilege Vulnerability
CVE-2026-208777.8 HIGHWindows Management Services Elevation of Privilege 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-73

V. Comments for CVE-2026-20931

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