CVE-2026-20853

Published: Jan 13, 2026Modified: Jul 30, 2026

7.4

Vector

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

Exploitability: 1.4 / Impact: 5.9

Source: secure@microsoft.com (Secondary)

Description

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

Affected (9)

Products: Microsoft: Windows 10 1607, Windows 10 1809, Windows 10 21h2, Windows 10 22h2, Windows 11 23h2, Windows 11 24h2, Windows 11 25h2

7 products

Configuration A

9 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1607	version < 10.0.14393.8783
Microsoft Windows 10 1607	version < 10.0.14393.8783
Microsoft Windows 10 1809	version < 10.0.17763.8276
Microsoft Windows 10 1809	version < 10.0.17763.8276
Microsoft Windows 10 21h2	version < 10.0.19044.6809
Microsoft Windows 10 22h2	version < 10.0.19045.6809
Microsoft Windows 11 23h2	version < 10.0.22631.6491
Microsoft Windows 11 24h2	version < 10.0.26100.7623
Microsoft Windows 11 25h2	version < 10.0.26200.7623

Related CWEs

CWE-362

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

The product contains a code sequence that can run concurrently with other code, and the code sequence 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 that is operating concurrently.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20853

Source: secure@microsoft.com

Vendor Advisory

Timeline

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