CVE-2026-69438: CWE-681: Incorrect Conversion between Numeric Types in Microsoft Windows 10 Version 1607
Description
CVE-2026-69438 is a high-severity vulnerability in Microsoft Windows 10 Version 1607 involving incorrect conversion between numeric types in Microsoft JScript. This flaw allows an unauthorized attacker to execute code remotely over a network. The vulnerability affects multiple Windows 10 builds prior to specific patch versions. An official fix is available from Microsoft.
CVSS v3.1
Score 8.1high
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 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-2026-69438 and classified under CWE-681 (Incorrect Conversion between Numeric Types), affects Microsoft JScript in Windows 10 Version 1607 and related builds. It allows remote code execution by exploiting improper numeric type conversions. The CVSS 3.1 base score is 8.1, indicating high severity, with network attack vector, high impact on confidentiality, integrity, and availability, and requiring no privileges or user interaction. Multiple affected Windows 10 versions are listed with specific build ranges. Microsoft has released an official fix for this vulnerability.
Potential Impact
Successful exploitation enables an unauthorized attacker to execute arbitrary code remotely, potentially leading to full system compromise. The vulnerability impacts confidentiality, integrity, and availability of affected systems.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft for the affected Windows 10 versions as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69438.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T20:59:32.784Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69438","vendor":"Microsoft"}]
Threat ID: 6aa044f8acd9273b49fa8073
Added to database: 09/08/2026, 17:25:12 UTC
Last enriched: 10/16/2026, 21:12:41 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 44
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