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CVE-2026-21533

Windows Remote Desktop Services 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 8 more
None on Exploit-DB, Metasploit or GitHub

Summary

Microsoft Windows systems running Remote Desktop Services are affected by this vulnerability. An authorized user with access to the system could exploit it to gain higher privileges on the local machine.

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

Read the original description

Improper privilege management in Windows Remote Desktop 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 2012

    From 6.2.9200.0 · fixed in 6.2.9200.25923

  • Microsoft Windows Server 2012 (Server Core installation)

    From 6.2.9200.0 · fixed in 6.2.9200.25923

  • Microsoft Windows Server 2012 R2

    From 6.3.9600.0 · fixed in 6.3.9600.23022

  • Microsoft Windows Server 2012 R2 (Server Core installation)

    From 6.3.9600.0 · fixed in 6.3.9600.23022

  • 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