CVE-2026-21508

HIGH

Microsoft Windows 10 1607 < 10.0.14393.8868 - Authentication Bypass

Title source: rule

Description

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

Exploits (1)

nomisec WORKING POC 17 stars
by 0xc4r · poc
https://github.com/0xc4r/CVE-2026-21508_POC

References (1)

Scores

CVSS v3 7.0
EPSS 0.0006
EPSS Percentile 18.0%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-426 CWE-287
Status published
Products (36)
microsoft/windows_10_1607 < 10.0.14393.8868 (2 CPE variants)
microsoft/windows_10_1809 < 10.0.17763.8389 (2 CPE variants)
microsoft/windows_10_21h2 < 10.0.19044.6937 (3 CPE variants)
microsoft/windows_10_22h2 < 10.0.19045.6937 (3 CPE variants)
Microsoft/Windows 10 Version 1607 10.0.14393.0 - 10.0.14393.8868
Microsoft/Windows 10 Version 1809 10.0.17763.0 - 10.0.17763.8389
Microsoft/Windows 10 Version 21H2 10.0.19044.0 - 10.0.19044.6937
Microsoft/Windows 10 Version 22H2 10.0.19045.0 - 10.0.19045.6937
microsoft/windows_11_23h2 < 10.0.22631.6649 (2 CPE variants)
microsoft/windows_11_24h2 < 10.0.26100.7781 (2 CPE variants)
... and 26 more
Published Feb 10, 2026
Tracked Since Feb 18, 2026