CVE-2026-85796: CWE-197: Numeric Truncation Error in Microsoft Windows 10 Version 1607
Description
CVE-2026-85796 is a numeric truncation error vulnerability in the Windows Installer component of Microsoft Windows 10 Version 1607 and related builds. This flaw allows an authorized local attacker to elevate privileges on the affected system. The vulnerability has a high severity rating with a CVSS score of 7.8. Microsoft has released official fixes to address this issue.
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 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 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-2026-85796 and classified under CWE-197 (Numeric Truncation Error), affects multiple builds of Microsoft Windows 10 including Version 1607 and later updates. The flaw exists in the Windows Installer component and permits an authorized local attacker to elevate privileges by exploiting the numeric truncation error. The CVSS 3.1 base score is 7.8, indicating high severity with local attack vector, low complexity, and no user interaction required. Microsoft has published an official security update to remediate this vulnerability.
Potential Impact
Successful exploitation of this vulnerability allows an authorized local attacker to elevate their privileges, potentially gaining higher system rights than intended. This can lead to full system compromise depending on the privileges escalated. The vulnerability does not require user interaction and has a low attack complexity, increasing the risk on affected systems.
Mitigation Recommendations
Microsoft has released official security updates that fix this vulnerability. It is recommended to apply the latest patches provided by Microsoft for the affected Windows 10 versions to mitigate this issue. No additional mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-04T18:08:54.993Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85796","vendor":"Microsoft"}]
Threat ID: 6ace853a2cdf04f6569fe844
Added to database: 10/13/2026, 19:23:38 UTC
Last enriched: 10/14/2026, 03:48:19 UTC
Last updated: 10/14/2026, 03:48:19 UTC
Views: 6
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