CVE-2026-27906: CWE-20: Improper Input Validation in Microsoft Windows 10 Version 21H2
CVE-2026-27906 is a medium severity vulnerability in Microsoft Windows 10 Version 21H2 involving improper input validation in the Windows Hello feature. This flaw allows an authorized local attacker with high privileges to bypass a security feature. The vulnerability does not require user interaction and impacts confidentiality but not integrity or availability. An official fix is available from Microsoft to address this issue.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-27906) affects Windows 10 Version 21H2 (build 10.0.19044.0) and is caused by improper input validation in the Windows Hello biometric authentication system. An attacker with authorized local access and high privileges can exploit this flaw to bypass a security feature, potentially gaining unauthorized access to protected resources. The CVSS 3.1 base score is 4.4 (medium severity), reflecting local attack vector, low attack complexity, required high privileges, no user interaction, unchanged scope, high confidentiality impact, and no impact on integrity or availability. Microsoft has released an official fix for this vulnerability.
Potential Impact
The vulnerability allows an authorized local attacker with high privileges to bypass a security feature in Windows Hello, potentially compromising confidentiality of the system. There is no reported impact on system integrity or availability. No known exploits are currently observed in the wild.
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
CVE-2026-27906 is a medium severity vulnerability in Microsoft Windows 10 Version 21H2 involving improper input validation in the Windows Hello feature. This flaw allows an authorized local attacker with high privileges to bypass a security feature. The vulnerability does not require user interaction and impacts confidentiality but not integrity or availability. An official fix is available from Microsoft to address this issue.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-27906) affects Windows 10 Version 21H2 (build 10.0.19044.0) and is caused by improper input validation in the Windows Hello biometric authentication system. An attacker with authorized local access and high privileges can exploit this flaw to bypass a security feature, potentially gaining unauthorized access to protected resources. The CVSS 3.1 base score is 4.4 (medium severity), reflecting local attack vector, low attack complexity, required high privileges, no user interaction, unchanged scope, high confidentiality impact, and no impact on integrity or availability. Microsoft has released an official fix for this vulnerability.
Potential Impact
The vulnerability allows an authorized local attacker with high privileges to bypass a security feature in Windows Hello, potentially compromising confidentiality of the system. There is no reported impact on system integrity or availability. No known exploits are currently observed in the wild.
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: 4/14/2026, 5:32:13 PM
Last enriched: 4/14/2026, 7:07:29 PM
Last updated: 4/15/2026, 6:08:46 AM
Views: 3
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