CVE-2026-21533HIGH 7.8CISA KEVEPSS p88.8%

CVE-2026-21533Microsoft Windows Improper Privilege Management Vulnerability

Microsoft / Windows

Description

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

Scoring

CVSS 3.17.8 (HIGH)
VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS3.85% probability of exploitation · percentile 88.8% · 2026-06-19T12:03:05Z
Published2026-02-10
Last modified2026-03-30

CISA KEV entry

Added to KEV: 2026-02-10

Underlying weaknesses· 1

CWE-269

References

  1. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21533
  2. https://www.vicarius.io/vsociety/posts/cve-2026-21533-detection-script-privilege-escalation-vulnerability-in-windows-remote-desktop
  3. https://www.vicarius.io/vsociety/posts/cve-2026-21533-mitigation-script-privilege-escalation-vulnerability-in-windows-remote-desktop
  4. https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21533

1

TypeTargetConfidenceTier
WeaknessImproper Privilege Managementcwe-2690%live

(incoming)1

TypeTargetConfidenceTier
KEVEntryMicrosoft Windows Improper Privilege Management Vulnerabilitykev-cve-2026-215330%live

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Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.