CVE-2026-83926
Medium
Description
Improper certificate validation in Windows Hello allows an authorized attacker to bypass a security feature locally.
SeverityMedium
CVSS4.4
Exploit probability—
Product
Microsoft Windows
PublishedOct 13, 2026
First seenOct 13, 2026
Weakness typeCWE-295CWE-295
How to fix
Update
- microsoft windows_10_180910.0.17763.9376 or later
- microsoft windows_10_21h210.0.19044.7807 or later
- microsoft windows_10_22h210.0.19045.7807 or later
- microsoft windows_11_23h210.0.22631.7652 or later
- microsoft windows_11_24h210.0.26100.9711 or later
- microsoft windows_11_25h210.0.26200.9711 or later
- microsoft windows_11_26h110.0.28000.3231 or later
- microsoft windows_11_26h210.0.26300.9711 or later
- microsoft windows_server_201910.0.17763.9376 or later
- microsoft windows_server_202210.0.20348.5761 or later
- microsoft windows_server_202510.0.26100.33650 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft windows_10_1809 | v < 10.0.17763.9376, No range specified | 10.0.17763.9376 |
| microsoft windows_10_21h2 | v < 10.0.19044.7807 | 10.0.19044.7807 |
| microsoft windows_10_22h2 | v < 10.0.19045.7807 | 10.0.19045.7807 |
| microsoft windows_11_23h2 | v < 10.0.22631.7652 | 10.0.22631.7652 |
| microsoft windows_11_24h2 | v < 10.0.26100.9711 | 10.0.26100.9711 |
| microsoft windows_11_25h2 | v < 10.0.26200.9711 | 10.0.26200.9711 |
| microsoft windows_11_26h1 | v < 10.0.28000.3231 | 10.0.28000.3231 |
| microsoft windows_11_26h2 | v < 10.0.26300.9711 | 10.0.26300.9711 |
| microsoft windows_server_2019 | v < 10.0.17763.9376, No range specified | 10.0.17763.9376 |
| microsoft windows_server_2022 | v < 10.0.20348.5761, No range specified | 10.0.20348.5761 |
| microsoft windows_server_2025 | v < 10.0.26100.33650, No range specified | 10.0.26100.33650 |
| microsoft windows_10_21H2 | No range specified | — |
| microsoft windows_10_22H2 | No range specified | — |
| microsoft windows_11_25H2 | No range specified | — |
| microsoft windows_11_23H2 | No range specified | — |
| microsoft windows_11_24H2 | No range specified | — |
| microsoft windows_11_26H1 | No range specified | — |
| microsoft windows_11_version_26h2_for_arm64-based_systems | No range specified | — |
| microsoft windows_11_version_26h2_for_x64-based_systems | No range specified | — |
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