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CVE-2026-21533

HighPublished

Windows Remote Desktop Services Elevation of Privilege Vulnerability

Published: Feb 10, 2026
Updated: Aug 19, 2026
Assigning CNA: microsoft
Evidence observed: Feb 10, 2026

Primary CVSS

7.8/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

3.9%

Low · next 30 days

Percentile: 89.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

Improper privilege management in Windows Remote Desktop allows an authorized attacker to elevate privileges locally.

Sources

CVE-2026-21533_Scanner.pyDetection
Detector de CVE-2026-21533: escalada de privilegios a SYSTEM en Servicios de Escritorio Remoto (RDS) de Windows.
RDPVulnarableCheckScanner
Scans for CVE-2026-21533 vulnerability in RDP services, providing detection and assessment for affected systems.

Responsible use

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