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CVE-2026-62727— Windows Telephony Service 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 Telephony Server是美国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 存在竞争条件问题漏洞，该漏洞源于Windows Telephony Service中并发执行使用共享资源但同步不当（竞争条件），可能导致授权攻击者本地提升权限。以下产品及版本受到影响：Windows 10 Version 1607 10.0.1439

CVSS 7.0 · High EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 20

VendorProduct Version RangeStatus
Microsoft Windows 10 Version 1607 10.0.14393.0< 10.0.14393.9418 affected
Microsoft Windows 10 Version 1809 10.0.17763.0< 10.0.17763.9121 affected
Microsoft Windows 10 Version 21H2 10.0.19044.0< 10.0.19044.7663 affected
Microsoft Windows 10 Version 22H2 10.0.19045.0< 10.0.19045.7663 affected
Microsoft Windows 11 version 23H2 10.0.22631.0< 10.0.22631.7517 affected
Microsoft Windows 11 Version 23H2 10.0.22631.0< 10.0.22631.7517 affected
Microsoft Windows 11 Version 24H2 10.0.26100.0< 10.0.26100.9168 affected
Microsoft Windows 11 Version 25H2 10.0.26200.0< 10.0.26200.9168 affected
Microsoft Windows 11 version 26H1 10.0.28000.0< 10.0.28000.2704 affected
Microsoft Windows Server 2012 6.2.9200.0< 6.2.9200.26280 affected
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0< 6.2.9200.26280 affected
Microsoft Windows Server 2012 R2 6.3.9600.0< 6.3.9600.23338 affected
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0< 6.3.9600.23338 affected
Microsoft Windows Server 2016 10.0.14393.0< 10.0.14393.9418 affected
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0< 10.0.14393.9418 affected
Microsoft Windows Server 2019 10.0.17763.0< 10.0.17763.9121 affected
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0< 10.0.17763.9121 affected
Microsoft Windows Server 2022 10.0.20348.0< 10.0.20348.5499 affected
Microsoft Windows Server 2025 10.0.26100.0< 10.0.26100.33296 affected
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0< 10.0.26100.33296 affected
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I. Basic Information for CVE-2026-62727

Vulnerability Information
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Vulnerability Title
Windows Telephony Service Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Telephony Service allows an authorized attacker to elevate privileges locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Telephony Server 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Telephony Server是美国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 存在竞争条件问题漏洞，该漏洞源于Windows Telephony Service中并发执行使用共享资源但同步不当（竞争条件），可能导致授权攻击者本地提升权限。以下产品及版本受到影响：Windows 10 Version 1607 10.0.1439
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 ~ 10.0.14393.9418 -
Microsoft Windows 10 Version 1809 10.0.17763.0 ~ 10.0.17763.9121 -
Microsoft Windows 10 Version 21H2 10.0.19044.0 ~ 10.0.19044.7663 -
Microsoft Windows 10 Version 22H2 10.0.19045.0 ~ 10.0.19045.7663 -
Microsoft Windows 11 version 23H2 10.0.22631.0 ~ 10.0.22631.7517 -
Microsoft Windows 11 Version 23H2 10.0.22631.0 ~ 10.0.22631.7517 -
Microsoft Windows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.9168 -
Microsoft Windows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.9168 -
Microsoft Windows 11 version 26H1 10.0.28000.0 ~ 10.0.28000.2704 -
Microsoft Windows Server 2012 6.2.9200.0 ~ 6.2.9200.26280 -
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0 ~ 6.2.9200.26280 -
Microsoft Windows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.23338 -
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.23338 -
Microsoft Windows Server 2016 10.0.14393.0 ~ 10.0.14393.9418 -
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.9418 -
Microsoft Windows Server 2019 10.0.17763.0 ~ 10.0.17763.9121 -
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.9121 -
Microsoft Windows Server 2022 10.0.20348.0 ~ 10.0.20348.5499 -
Microsoft Windows Server 2025 10.0.26100.0 ~ 10.0.26100.33296 -
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.33296 -

II. Public POCs for CVE-2026-62727

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III. Intelligence Information for CVE-2026-62727

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Vendor Advisories for CVE-2026-62727 (1)

IV. Related Vulnerabilities

Same product: Windows 10 Version 1607
Same vendor: Microsoft
Same weakness: CWE-362

V. Comments for CVE-2026-62727

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