CVE-2026-20804: CWE-266: Incorrect Privilege Assignment in Microsoft Windows 10 Version 1607
Incorrect privilege assignment in Windows Hello allows an unauthorized attacker to perform tampering locally.
AI Analysis
Technical Summary
This vulnerability, tracked as CVE-2026-20804, is classified under CWE-266 (Incorrect Privilege Assignment) and affects Windows Hello in Microsoft Windows 10 Version 1607 (build 10.0.14393.0). It allows an attacker with local access to gain unauthorized privileges to perform tampering. The CVSS v3.1 vector indicates local attack vector with low complexity, no privileges required, no user interaction, and results in high confidentiality and integrity impact. Microsoft has published an official fix to remediate this vulnerability.
Potential Impact
An unauthorized attacker with local access can exploit this vulnerability to gain elevated privileges improperly assigned by Windows Hello, enabling tampering with system components or data. The impact affects confidentiality and integrity but does not affect availability. There are no known exploits 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-2026-20804 to remediate this vulnerability.
CVE-2026-20804: CWE-266: Incorrect Privilege Assignment in Microsoft Windows 10 Version 1607
Description
Incorrect privilege assignment in Windows Hello allows an unauthorized attacker to perform tampering locally.
CVSS v3.1
Score 7.7high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, tracked as CVE-2026-20804, is classified under CWE-266 (Incorrect Privilege Assignment) and affects Windows Hello in Microsoft Windows 10 Version 1607 (build 10.0.14393.0). It allows an attacker with local access to gain unauthorized privileges to perform tampering. The CVSS v3.1 vector indicates local attack vector with low complexity, no privileges required, no user interaction, and results in high confidentiality and integrity impact. Microsoft has published an official fix to remediate this vulnerability.
Potential Impact
An unauthorized attacker with local access can exploit this vulnerability to gain elevated privileges improperly assigned by Windows Hello, enabling tampering with system components or data. The impact affects confidentiality and integrity but does not affect availability. There are no known exploits 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-2026-20804 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-03T05:54:20.371Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20804","vendor":"Microsoft"}]
Threat ID: 69668adaa60475309f9adf37
Added to database: 01/13/2026, 18:11:38 UTC
Last enriched: 07/30/2026, 23:50:47 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 231
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