CVE-2026-88127: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Description
CVE-2026-88127 is a use-after-free vulnerability in the Windows SMB Server component affecting multiple builds of Windows 10 Version 1607 and later. It allows an authorized local attacker to elevate privileges. The vulnerability has a high severity score and has been officially fixed by Microsoft.
CVSS v3.1
Score 7.0high
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 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows 11 Version 26H2
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 involves a use-after-free condition in the Windows SMB Server, which can be exploited by an authorized local attacker to elevate privileges on affected Windows 10 Version 1607 builds and later versions. The flaw is tracked as CWE-416. Microsoft has published an official fix addressing this issue. The CVSS 3.1 base score is 7.0, indicating high severity, with attack vector local, high attack complexity, low privileges required, no user interaction, and impacts on confidentiality, integrity, and availability.
Potential Impact
An authorized local attacker can exploit this use-after-free vulnerability to elevate privileges, potentially gaining higher system rights than intended. This could lead to full system compromise depending on the privileges escalated. The vulnerability affects confidentiality, integrity, and availability of the system.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the relevant security updates as provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88127 to remediate this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-09T21:53:00.397Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88127","vendor":"Microsoft"}]
Threat ID: 6ace855d2cdf04f6569ff517
Added to database: 10/13/2026, 19:24:13 UTC
Last enriched: 10/14/2026, 01:48:24 UTC
Last updated: 10/14/2026, 01:48:24 UTC
Views: 2
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