CVE-2026-27906: CWE-20: Improper Input Validation in Microsoft Windows 10 Version 21H2
Improper input validation in Windows Hello allows an authorized attacker to bypass a security feature locally.
AI Analysis
Technical Summary
This vulnerability involves improper input validation in the Windows Hello component of Microsoft Windows 10 Version 21H2 (build 10.0.19044.0). It enables a local attacker with authorized access and high privileges to bypass a security feature without user interaction. The CVSS vector indicates low attack complexity and no user interaction required, but privileges are high and the impact is limited to confidentiality. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized local attacker with high privileges can bypass a security feature in Windows Hello, potentially leading to unauthorized access to confidential information. There is no impact on integrity or availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27906 to remediate this vulnerability.
CVE-2026-27906: CWE-20: Improper Input Validation in Microsoft Windows 10 Version 21H2
Description
Improper input validation in Windows Hello allows an authorized attacker to bypass a security feature locally.
CVSS v3.1
Score 4.4medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves improper input validation in the Windows Hello component of Microsoft Windows 10 Version 21H2 (build 10.0.19044.0). It enables a local attacker with authorized access and high privileges to bypass a security feature without user interaction. The CVSS vector indicates low attack complexity and no user interaction required, but privileges are high and the impact is limited to confidentiality. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized local attacker with high privileges can bypass a security feature in Windows Hello, potentially leading to unauthorized access to confidential information. There is no impact on integrity or availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27906 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-02-24T21:35:49.685Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27906","vendor":"Microsoft"}]
Threat ID: 69de7a1d82d89c981fd6a72b
Added to database: 04/14/2026, 17:32:13 UTC
Last enriched: 06/19/2026, 17:01:25 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 92
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