CVE-2026-21533
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Summary
Improper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 < 10.0.14393.8868 | affected |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 < 10.0.17763.8389 | affected |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 < 10.0.19044.6937 | affected |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 < 10.0.19045.6937 | affected |
| Microsoft | Windows 11 version 22H3 | 10.0.22631.0 < 10.0.22631.6649 | affected |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 < 10.0.22631.6649 | affected |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 < 10.0.26100.7840 | affected |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 < 10.0.26200.7840 | affected |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 < 10.0.28000.1575 | affected |
| Microsoft | Windows 11 Version 26H1 | 10.0.28000.0 < 10.0.28000.1575 | affected |
| Microsoft | Windows Server 2012 | 6.2.9200.0 < 6.2.9200.25923 | affected |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 < 6.2.9200.25923 | affected |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 < 6.3.9600.23022 | affected |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 < 6.3.9600.23022 | affected |
| Microsoft | Windows Server 2016 | 10.0.14393.0 < 10.0.14393.8868 | affected |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 < 10.0.14393.8868 | affected |
| Microsoft | Windows Server 2019 | 10.0.17763.0 < 10.0.17763.8389 | affected |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 < 10.0.17763.8389 | affected |
| Microsoft | Windows Server 2022 | 10.0.20348.0 < 10.0.20348.4773 | affected |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 < 10.0.25398.2149 | affected |
| Microsoft | Windows Server 2025 | 10.0.26100.0 < 10.0.26100.32370 | affected |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 < 10.0.26100.32370 | affected |
Weaknesses
- CWE-269: CWE-269: Improper Privilege Management
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: active
- Automatable: no
- Technical Impact: total
Additional References
CVE Program Container
Additional References
- https://www.vicarius.io/vsociety/posts/cve-2026-21533-detection-script-privilege-escalation-vulnerability-in-windows-remote-desktop
- https://www.vicarius.io/vsociety/posts/cve-2026-21533-mitigation-script-privilege-escalation-vulnerability-in-windows-remote-desktop
References
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