CVE-2026-50391: CWE-269: Improper Privilege Management in Microsoft Windows 10 Version 1607
Description
Improper privilege management in Windows Group Policy allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Affected software
Microsoft
Windows 10 Version 1607
Microsoft
Windows 10 Version 1809
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2012
Microsoft
Windows Server 2012 (Server Core installation)
Microsoft
Windows Server 2012 R2
Microsoft
Windows Server 2012 R2 (Server Core installation)
Microsoft
Windows Server 2016
Microsoft
Windows Server 2016 (Server Core installation)
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CVE-2026-50391 and classified under CWE-269 (Improper Privilege Management), affects Windows 10 Version 1607 (build 10.0.14393.0). It arises from improper handling of privileges within Windows Group Policy, enabling an authorized attacker with local access to escalate their privileges. The vulnerability has a CVSS 3.1 base score of 7.8, indicating high severity, with impacts on confidentiality, integrity, and availability. Microsoft has released an official fix for this issue as documented in their security update guide.
Potential Impact
An authorized local attacker can exploit this vulnerability to elevate their privileges, potentially gaining higher-level access than intended. This can lead to full system compromise, including unauthorized access to sensitive information, modification of system settings, and disruption of system availability.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. It is recommended to apply the security update provided by Microsoft as soon as possible to remediate this issue. No additional mitigation steps are indicated beyond applying the official patch.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-04T18:55:14.745Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50391","vendor":"Microsoft"}]
Threat ID: 6a56769768715ace43f08e4c
Added to database: 07/14/2026, 17:49:11 UTC
Last enriched: 08/13/2026, 14:46:27 UTC
Last updated: 10/13/2026, 18:57:37 UTC
Views: 148
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