CVE Watch—

CVE-2026-21533

Microsoft Windows Improper Privilege Management Vulnerability

CVSS

—

No CVSS

EPSS

3.8%

p89

KEV

YES

Feb 10, 2026

Exploit Today

0-100

Published: — · Last modified: —

EPSS · 30d

3.8%EPSS · 30 days3.8%

2026-06-302026-07-17

KEV catalog record

Product

Microsoft / Windows

Vulnerability

Microsoft Windows Improper Privilege Management Vulnerability

Added to KEV

Feb 10, 2026

Remediate by

Mar 3, 2026

Known ransomware use

Summary description

Microsoft Windows Remote Desktop Services contains an improper privilege management vulnerability that could allow an authorized attacker to elevate privileges locally.

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Notes

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21533 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21533

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