CVE-2026-20931

HIGH
2026-01-13 [email protected]
8.0
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 13, 2026 - 18:16 nvd
HIGH 8.0

Tags

Windows Windows 11 23h2 Windows Server 2022 23h2 Windows Server 2008 Windows 10 1607 Windows Server 2022 Windows Server 2025 Windows Server 2016 Windows 11 24h2 Windows Server 2019 Windows 10 21h2 Windows Server 2012 Windows 11 25h2 Windows 10 22h2 Windows 10 1809 Microsoft

Description

External control of file name or path in Windows Telephony Service allows an authorized attacker to elevate privileges over an adjacent network.

Analysis

Windows Telephony Service on multiple Windows versions (10, 11, Server 2008/2022) contains an improper file path control vulnerability that enables authenticated attackers on the same network to escalate privileges to system level. An attacker with local user credentials can manipulate file name or path parameters to achieve elevated privileges without user interaction. …

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Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

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Priority Score

41
Low Medium High Critical
KEV: 0
EPSS: +0.8
CVSS: +40
POC: 0

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CVE-2026-20931 vulnerability details – vuln.today
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