CVE-2026-71340: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Description
CVE-2026-71340 is a use-after-free vulnerability in the Windows File History Service affecting multiple builds of Windows 10 Version 1607 and later. This flaw allows an authorized local attacker to elevate privileges. The vulnerability has a high severity rating 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 Server 2016
Microsoft
Windows Server 2016 (Server Core installation)
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-71340) involves a use-after-free condition in the Windows File History Service on Windows 10 Version 1607 and later builds. An authorized attacker with local access can exploit this flaw to elevate their privileges on the affected system. The vulnerability has a CVSS v3.1 base score of 7.0, indicating high severity, with attack vector local, high attack complexity, and requiring low privileges but no user interaction. Microsoft has released an official fix addressing this issue.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate their privileges, potentially gaining higher system rights. This could lead to full control over the affected system, impacting confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft for Windows 10 Version 1607 and affected builds to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-05T18:41:50.334Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-71340","vendor":"Microsoft"}]
Threat ID: 6aa04540acd9273b49fa9c3d
Added to database: 09/08/2026, 17:26:24 UTC
Last enriched: 10/16/2026, 21:43:27 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 24
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