Race Condition in TWINUI Allows Local Privilege Escalation

Publication date: 2026-01-13

Last updated on: 2026-01-13

Assigner: Microsoft Corporation

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-01-13

Last Modified

2026-01-13

Generated

2026-07-06

AI Q&A

2026-01-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-20826

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	twinui	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-362	The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Attack-Flow Graph

Executive Summary

This vulnerability is a race condition in the Tablet Windows User Interface (TWINUI) Subsystem where concurrent execution uses a shared resource without proper synchronization. This flaw allows an authorized attacker to elevate their privileges locally on the affected system. [1]

Mitigation Strategies

Apply the security updates provided by Microsoft for the Tablet Windows User Interface (TWINUI) Subsystem to address the race condition vulnerability that allows local privilege escalation. [1]

Impact Analysis

An attacker who already has some level of access can exploit this vulnerability to gain higher privileges on the system. This elevation of privilege can lead to unauthorized actions, potentially compromising system integrity, confidentiality, and availability. [1]

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