CVE-2026-21533

Microsoft Windows Improper Privilege Management Vulnerability

Microsoft — Windows

Added to KEV catalog: 10 February 2026
Federal remediation due date: 3 March 2026
Weakness classification (CWE): CWE-269

CISA 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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