CVE-2026-72947: CWE-191: Integer Underflow (Wrap or Wraparound) in Microsoft Windows 10 Version 1607
Description
CVE-2026-72947 is an integer underflow vulnerability in the Windows File History Service on Microsoft Windows 10 Version 1607 and later builds. This flaw allows an authorized local attacker with high privileges to elevate their privileges further. The vulnerability has a CVSS score of 6.4 (medium severity) and affects multiple Windows 10 builds prior to specific patched versions. An official fix is available from Microsoft.
CVSS v3.1
Score 6.4medium
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, identified as CWE-191 (Integer Underflow), exists in the Windows File History Service component of Microsoft Windows 10 Version 1607 and later. The flaw allows an authorized attacker with high privileges to exploit an integer underflow condition, potentially leading to privilege escalation locally. The affected versions include multiple Windows 10 builds starting from 10.0.14393.0 up to but excluding patched builds such as 10.0.14393.9512 and others. Microsoft has released an official fix addressing this issue.
Potential Impact
An authorized local attacker with high privileges can exploit this integer underflow vulnerability to elevate their privileges further on the affected Windows 10 systems. This could lead to complete compromise of the affected system's confidentiality, integrity, and availability.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the available security updates to the affected Windows 10 versions as soon as possible to remediate this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-10T18:14:23.517Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-72947","vendor":"Microsoft"}]
Threat ID: 6aa04546acd9273b49fa9cf1
Added to database: 09/08/2026, 17:26:30 UTC
Last enriched: 10/16/2026, 21:46:12 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 33
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