CVE-2026-21508

Windows Storage Elevation of Privilege Vulnerability

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

Affected

Microsoft · Windows 10 Version 1607 · Windows 10 Version 1809 · Windows 10 Version 21H2 · Windows 10 Version 22H2 · Windows 11 version 22H3 · Windows 11 Version 23H2

CVSS v3.1 NVD

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

EPSS

0.45% chance of exploitation in the next 30 days, 38th percentile

Published

2026-02-10

Updated

2026-08-19

Proof-of-concept exploits (1)

• 0xc4r/CVE-2026-21508_POC29★ · 2026-02-11

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21508

References

• CVE Record
• NVD entry