CVE-2026-69395: CWE-134: Use of Externally-Controlled Format String in Microsoft Windows 10 Version 1607
Description
CVE-2026-69395 is a medium severity vulnerability in Microsoft Windows 10 Version 1607 involving an externally-controlled format string flaw in Active Directory Certificate Services (AD CS). This flaw allows an authorized attacker to disclose information over a network. The vulnerability affects multiple Windows 10 builds and has an official fix available from Microsoft.
CVSS v3.1
Score 6.5medium
Affected software
Microsoft
Windows 10 Version 1607
Microsoft
Windows 10 Version 1809
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 (CVE-2026-69395) is a use of externally-controlled format string in Active Directory Certificate Services (AD CS) on Microsoft Windows 10 Version 1607 and related builds. An authorized attacker can exploit this flaw to disclose information over a network. The CVSS 3.1 base score is 6.5, indicating medium severity, with network attack vector, low attack complexity, and requiring privileges but no user interaction. The vulnerability has been officially fixed by Microsoft.
Potential Impact
An authorized attacker can leverage this vulnerability to disclose sensitive information over the network. There is no indication of integrity or availability impact. No known exploits are reported in the wild at this time.
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 advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69395.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T20:57:58.962Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69395","vendor":"Microsoft"}]
Threat ID: 6aa044f2acd9273b49fa7f8a
Added to database: 09/08/2026, 17:25:06 UTC
Last enriched: 10/16/2026, 21:09:19 UTC
Last updated: 10/23/2026, 01:15:26 UTC
Views: 37
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