CVE-2026-20826

HIGH
2026-01-13 [email protected]
7.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
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 7.8

Tags

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

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Tablet Windows User Interface (TWINUI) Subsystem allows an authorized attacker to elevate privileges locally.

Analysis

Privilege escalation in Windows Tablet UI (TWINUI) subsystem on Windows 10, Windows Server 2022, and Windows Server 2025 stems from improper synchronization of shared resources, enabling authenticated local attackers to gain elevated privileges. The race condition vulnerability affects multiple Windows versions and currently has no available patch.

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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

39
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +39
POC: 0

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CVE-2026-20826 vulnerability details – vuln.today
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