---
id: CVE-2026-27906
title: Windows Hello Security Feature Bypass Vulnerability
summary: >-
  Improper input validation in Windows Hello allows an authorized attacker to
  bypass a security feature locally.
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-20
vendor: Microsoft
product: Windows 10 Version 21H2
affected:
  - windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7184
  - windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19045.7184
  - windows_11_version_22h3 >= 10.0.22631.0 < 10.0.22631.6936
  - windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.6936
  - windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.8246
  - windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.8246
  - windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.1836
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-04-14T18:03:47.349252Z'
published: '2026-04-14'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T17:25:02.888Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-27906'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27906'
    label: Windows Hello Security Feature Bypass Vulnerability
tags:
  - cve.org
epss: 0.00409
epssPercentile: 0.3251
ingestedAt: '2026-09-25T18:14:20.456Z'
---

## Overview

Improper input validation in Windows Hello allows an authorized attacker to bypass a security feature locally.

## Affected

- `windows_10_version_21h2 >= 10.0.19044.0 < 10.0.19044.7184`
- `windows_10_version_22h2 >= 10.0.19045.0 < 10.0.19045.7184`
- `windows_11_version_22h3 >= 10.0.22631.0 < 10.0.22631.6936`
- `windows_11_version_23h2 >= 10.0.22631.0 < 10.0.22631.6936`
- `windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.8246`
- `windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.8246`
- `windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.1836`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.