CVE-2026-20853

Published: Jan 13, 2026Modified: Jan 15, 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

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	Before 10.0.14393.8783
Microsoft Windows 10 1607	Before 10.0.14393.8783
Microsoft Windows 10 1809	Before 10.0.17763.8276
Microsoft Windows 10 1809	Before 10.0.17763.8276
Microsoft Windows 10 21h2	Before 10.0.19044.6809
Microsoft Windows 10 22h2	Before 10.0.19045.6809
Microsoft Windows 11 23h2	Before 10.0.22631.6491
Microsoft Windows 11 24h2	Before 10.0.26100.7623
Microsoft Windows 11 25h2	Before 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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