Microsoft Windows Improper Privilege Management Vulnerability

HIGH 7.8EXPLOITED (CISA KEV)CVE-2026-21533 · Published 10/02/2026 · updated 17/06/2026

Microsoft Windows Improper Privilege Management Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 10/02/2026. Patch affected systems as an emergency.

Package	Affected versions	Patched versions
Windows Microsoft	Versions not published yet (product named by CISA KEV)

Description

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

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21533 · Vendor Advisory
vicarius.io/vsociety/posts/cve-2026-21533-detection-script-privilege-escalation-vulnerability-in-windows-remote-desktop · Third Party Advisory
vicarius.io/vsociety/posts/cve-2026-21533-mitigation-script-privilege-escalation-vulnerability-in-windows-remote-desktop · Mitigation
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2026-21533

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