CVE-2026-81354

Published: Sep 8, 2026Modified: Sep 10, 2026

8.2

Vector

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

Exploitability: 1.5 / Impact: 6.0

Source: secure@microsoft.com (Secondary)

Description

Heap-based buffer overflow in Windows Hello allows an authorized attacker to elevate privileges locally.

Affected (17)

Products: Microsoft: Windows 10 1809, Windows 10 21h2, Windows 10 22h2, Windows 11 23h2, Windows 11 24h2, Windows 11 25h2, Windows 11 26h1, Windows Server 2019

8 products

Windows 10 1809

Windows 10 21h2

Windows 10 22h2

Windows 11 23h2

Windows 11 24h2

Windows 11 25h2

Windows 11 26h1

Windows Server 2019

Configuration A

17 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1809	version < 10.0.17763.9245
Microsoft Windows 10 1809	version < 10.0.17763.9245
Microsoft Windows 10 21h2	version < 10.0.19044.7725
Microsoft Windows 10 21h2	version < 10.0.19044.7725
Microsoft Windows 10 21h2	version < 10.0.19044.7725
Microsoft Windows 10 22h2	version < 10.0.19045.7725
Microsoft Windows 10 22h2	version < 10.0.19045.7725
Microsoft Windows 10 22h2	version < 10.0.19045.7725
Microsoft Windows 11 23h2	version < 10.0.22631.7582
Microsoft Windows 11 23h2	version < 10.0.22631.7582
Microsoft Windows 11 24h2	version < 10.0.26100.9445
Microsoft Windows 11 24h2	version < 10.0.26100.9445
Microsoft Windows 11 25h2	version < 10.0.26200.9445
Microsoft Windows 11 25h2	version < 10.0.26200.9445
Microsoft Windows 11 26h1	version < 10.0.28000.2954
Microsoft Windows 11 26h1	version < 10.0.28000.2954
Microsoft Windows Server 2019	version < 10.0.17763.9245

Related CWEs

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81354

Source: secure@microsoft.com

PatchVendor Advisory

Timeline

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