CVE-2026-21519

Published: Feb 10, 2026Modified: Jun 17, 2026CISA KEV

7.8

Vector

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

Exploitability: 1.8 / Impact: 5.9

Source: secure@microsoft.com (Secondary)

Description

Access of resource using incompatible type ('type confusion') in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

Affected (21)

Products: Microsoft: Windows 10 1607, Windows 10 1809, Windows 10 21h2, Windows 10 22h2, Windows 11 23h2, Windows 11 24h2, Windows 11 25h2, Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows Server 2022 23h2, Windows Server 2025

12 products

Windows 10 1607

Windows 10 1809

Windows 10 21h2

Windows 10 22h2

Windows 11 23h2

Windows 11 24h2

Windows 11 25h2

Windows Server 2016

Windows Server 2019

Windows Server 2022

Windows Server 2022 23h2

Windows Server 2025

Configuration A

21 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1607	Before 10.0.14393.8868
Microsoft Windows 10 1607	Before 10.0.14393.8868
Microsoft Windows 10 1809	Before 10.0.17763.8389
Microsoft Windows 10 1809	Before 10.0.17763.8389
Microsoft Windows 10 21h2	Before 10.0.19044.6937
Microsoft Windows 10 21h2	Before 10.0.19044.6937
Microsoft Windows 10 21h2	Before 10.0.19044.6937
Microsoft Windows 10 22h2	Before 10.0.19045.6937
Microsoft Windows 10 22h2	Before 10.0.19045.6937
Microsoft Windows 10 22h2	Before 10.0.19045.6937
Microsoft Windows 11 23h2	Before 10.0.22631.6649
Microsoft Windows 11 23h2	Before 10.0.22631.6649
Microsoft Windows 11 24h2	Before 10.0.26100.7781
Microsoft Windows 11 24h2	Before 10.0.26100.7781
Microsoft Windows 11 25h2	Before 10.0.26200.7781
Microsoft Windows 11 25h2	Before 10.0.26200.7781
Microsoft Windows Server 2016	Before 10.0.14393.8868
Microsoft Windows Server 2019	Before 10.0.17763.8389
Microsoft Windows Server 2022	Before 10.0.20348.4711
Microsoft Windows Server 2022 23h2	Before 10.0.25398.2149
Microsoft Windows Server 2025	Before 10.0.26100.32313

Related CWEs

Access of Resource Using Incompatible Type ('Type Confusion')

The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

References (2)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21519

Source: secure@microsoft.com

Vendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21519

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

Timeline

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