CVE-2026-21508
High
Description
Improper authentication in Windows Storage allows an authorized attacker to elevate privileges locally.
SeverityHigh
CVSS7.0
Exploit probability—
Product
Microsoft Windows
PublishedFeb 10, 2026
First seenFeb 10, 2026
Weakness typeCWE-287Improper authenticationCWE-426CWE-426
How to fix
Update
- microsoft windows_10_160710.0.14393.8868 or later
- microsoft windows_10_180910.0.17763.8389 or later
- microsoft windows_10_21h210.0.19044.6937 or later
- microsoft windows_10_22h210.0.19045.6937 or later
- microsoft windows_11_23h210.0.22631.6649 or later
- microsoft windows_11_24h210.0.26100.7781 or later
- microsoft windows_11_25h210.0.26200.7781 or later
- microsoft windows_server_201610.0.14393.8868 or later
- microsoft windows_server_201910.0.17763.8389 or later
- microsoft windows_server_202210.0.20348.4711 or later
- microsoft windows_server_2022_23h210.0.25398.2149 or later
- microsoft windows_server_202510.0.26100.32313 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft windows_10_1607 | v < 10.0.14393.8868 | 10.0.14393.8868 |
| microsoft windows_10_1809 | v < 10.0.17763.8389 | 10.0.17763.8389 |
| microsoft windows_10_21h2 | v < 10.0.19044.6937 | 10.0.19044.6937 |
| microsoft windows_10_22h2 | v < 10.0.19045.6937 | 10.0.19045.6937 |
| microsoft windows_11_23h2 | v < 10.0.22631.6649 | 10.0.22631.6649 |
| microsoft windows_11_24h2 | v < 10.0.26100.7781 | 10.0.26100.7781 |
| microsoft windows_11_25h2 | v < 10.0.26200.7781 | 10.0.26200.7781 |
| microsoft windows_server_2012 | No range specified, r2 | — |
| microsoft windows_server_2016 | v < 10.0.14393.8868 | 10.0.14393.8868 |
| microsoft windows_server_2019 | v < 10.0.17763.8389 | 10.0.17763.8389 |
| microsoft windows_server_2022 | v < 10.0.20348.4711 | 10.0.20348.4711 |
| microsoft windows_server_2022_23h2 | v < 10.0.25398.2149 | 10.0.25398.2149 |
| microsoft windows_server_2025 | v < 10.0.26100.32313 | 10.0.26100.32313 |
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