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CVE-2026-21508

HighPublished

Windows Storage Elevation of Privilege Vulnerability

Published: Feb 10, 2026
Updated: Aug 19, 2026
Assigning CNA: microsoft
Evidence observed: Aug 25, 2026

Primary CVSS

7.0/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 37.4%
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.

Summary

Improper authentication in Windows Storage allows an authorized attacker to elevate privileges locally.

Sources

CVE-2026-21508_POCPoC
Proof-of-concept for CVE-2026-21508, demonstrating a DLL hijacking attack on Windows 11 that escalates privileges by loading a crafted DLL into WUDFHost.exe.

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