CVE-2026-62727

Windows Telephony Service Elevation of Privilege Vulnerability

State: Published
Severity: 7.0 High
Published: Aug 19, 2026
Updated: Oct 30, 2026
Reserved: Jul 14, 2026

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Telephony Service allows an authorized attacker to elevate privileges locally.

Scores

CVSS	Score	Vector	Source
3.1	7.0 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

Product	Versions
Windows 10 Version 1607Microsoft	10.0.14393.0 to before 10.0.14393.9418Affected
Windows 10 Version 1809Microsoft	10.0.17763.0 to before 10.0.17763.9121Affected
Windows 10 Version 21H2Microsoft	10.0.19044.0 to before 10.0.19044.7663Affected
Windows 10 Version 22H2Microsoft	10.0.19045.0 to before 10.0.19045.7663Affected
Windows 11 version 23H2Microsoft	10.0.22631.0 to before 10.0.22631.7517Affected
Windows 11 Version 23H2Microsoft	10.0.22631.0 to before 10.0.22631.7517Affected
Windows 11 Version 24H2Microsoft	10.0.26100.0 to before 10.0.26100.9168Affected
Windows 11 Version 25H2Microsoft	10.0.26200.0 to before 10.0.26200.9168Affected
Windows 11 version 26H1Microsoft	10.0.28000.0 to before 10.0.28000.2704Affected
Windows Server 2012Microsoft	6.2.9200.0 to before 6.2.9200.26280Affected
Windows Server 2012 (Server Core installation)Microsoft	6.2.9200.0 to before 6.2.9200.26280Affected
Windows Server 2012 R2Microsoft	6.3.9600.0 to before 6.3.9600.23338Affected
Windows Server 2012 R2 (Server Core installation)Microsoft	6.3.9600.0 to before 6.3.9600.23338Affected
Windows Server 2016Microsoft	10.0.14393.0 to before 10.0.14393.9418Affected
Windows Server 2016 (Server Core installation)Microsoft	10.0.14393.0 to before 10.0.14393.9418Affected
Windows Server 2019Microsoft	10.0.17763.0 to before 10.0.17763.9121Affected
Windows Server 2019 (Server Core installation)Microsoft	10.0.17763.0 to before 10.0.17763.9121Affected
Windows Server 2022Microsoft	10.0.20348.0 to before 10.0.20348.5499Affected
Windows Server 2025Microsoft	10.0.26100.0 to before 10.0.26100.33296Affected
Windows Server 2025 (Server Core installation)Microsoft	10.0.26100.0 to before 10.0.26100.33296Affected

References

Windows Telephony Service Elevation of Privilege Vulnerabilityvendor-advisorypatch

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