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CVE-2026-21519

Desktop Window Manager Elevation of Privilege Vulnerability

Published
Last modified
published
Listed in CISA KEV
Fix
Fixed in 10.0.14393.8868, 10.0.17763.8389, 10.0.19044.6937, 10.0.19045.6937, 10.0.22631.6649, and 6 more
None on Exploit-DB, Metasploit or GitHub

Summary

The Desktop Window Manager component in Microsoft Windows is affected by this flaw. A local user with low-level access could exploit it to gain higher, system-level privileges on the device.

Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.

Read the original description

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

Timeline

  1. Added to CISA KEV

    CISA has evidence of exploitation in the wild

  2. CVE published
  3. CISA remediation deadline

    Due date for US federal agencies to patch

  4. Record last updated

Affected versions

  • Microsoft Windows 10 Version 1607

    From 10.0.14393.0 · fixed in 10.0.14393.8868

  • Microsoft Windows 10 Version 1809

    From 10.0.17763.0 · fixed in 10.0.17763.8389

  • Microsoft Windows 10 Version 21H2

    From 10.0.19044.0 · fixed in 10.0.19044.6937

  • Microsoft Windows 10 Version 22H2

    From 10.0.19045.0 · fixed in 10.0.19045.6937

  • Microsoft Windows 11 version 22H3

    From 10.0.22631.0 · fixed in 10.0.22631.6649

  • Microsoft Windows 11 Version 23H2

    From 10.0.22631.0 · fixed in 10.0.22631.6649

  • Microsoft Windows 11 Version 24H2

    From 10.0.26100.0 · fixed in 10.0.26100.7840

  • Microsoft Windows 11 Version 25H2

    From 10.0.26200.0 · fixed in 10.0.26200.7840

  • Microsoft Windows 11 version 26H1

    From 10.0.28000.0 · fixed in 10.0.28000.1575

  • Microsoft Windows 11 Version 26H1

    From 10.0.28000.0 · fixed in 10.0.28000.1575

  • Microsoft Windows Server 2016

    From 10.0.14393.0 · fixed in 10.0.14393.8868

  • Microsoft Windows Server 2016 (Server Core installation)

    From 10.0.14393.0 · fixed in 10.0.14393.8868

  • Microsoft Windows Server 2019

    From 10.0.17763.0 · fixed in 10.0.17763.8389

  • Microsoft Windows Server 2019 (Server Core installation)

    From 10.0.17763.0 · fixed in 10.0.17763.8389

  • Microsoft Windows Server 2022

    From 10.0.20348.0 · fixed in 10.0.20348.4773

  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)

    From 10.0.25398.0 · fixed in 10.0.25398.2149

  • Microsoft Windows Server 2025

    From 10.0.26100.0 · fixed in 10.0.26100.32370

  • Microsoft Windows Server 2025 (Server Core installation)

    From 10.0.26100.0 · fixed in 10.0.26100.32370

References 1

msrc.microsoft.com