CVE-2026-21533
Windows Remote Desktop Services Elevation of Privilege Vulnerability
In short
A flaw in Windows Remote Desktop allows someone who already has access to the system to gain higher-level privileges and take control of more sensitive functions. This is dangerous because it lets attackers do more damage once they're already inside.
Technical detail
Improper privilege management in Windows Remote Desktop Services enables authenticated local attackers to escalate privileges through insufficient access controls. The vulnerability requires prior system access but allows unauthorized elevation to administrative or system-level context, potentially compromising system integrity and confidentiality.
Summary generated and translated by AI from the official description.
Improper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.
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
Affected products
Microsoft · Windows 10 Version 1607Microsoft · Windows 10 Version 1809Microsoft · Windows 10 Version 21H2Microsoft · Windows 10 Version 22H2Microsoft · Windows 11 version 22H3Microsoft · Windows 11 Version 23H2Microsoft · Windows 11 Version 24H2Microsoft · Windows 11 Version 25H2Microsoft · Windows 11 version 26H1Microsoft · Windows Server 2012Microsoft · Windows Server 2012 R2Microsoft · Windows Server 2012 R2 (Server Core installation)Microsoft · Windows Server 2012 (Server Core installation)Microsoft · Windows Server 2016Microsoft · Windows Server 2016 (Server Core installation)Microsoft · Windows Server 2019Microsoft · Windows Server 2019 (Server Core installation)Microsoft · Windows Server 2022Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)Microsoft · Windows Server 2025Microsoft · Windows Server 2025 (Server Core installation)Want to know if your infrastructure is exposed to this?
Talk to TrueHacking →References
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21533https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21533https://www.vicarius.io/vsociety/posts/cve-2026-21533-detection-script-privilege-escalation-vulnerability-in-windows-remote-desktophttps://www.vicarius.io/vsociety/posts/cve-2026-21533-mitigation-script-privilege-escalation-vulnerability-in-windows-remote-desktop