Format string error in Microsoft Windows and Windows Server - CVE-2026-69395
Published: September 8, 2026
Vulnerability identifier: #VU147658
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-69395
CWE-ID: CWE-134
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose information.
The vulnerability exists due to use of externally-controlled format string in Active Directory Certificate Services (AD CS) when handling network requests. A remote user can submit a crafted format string to disclose information.
Successful exploitation could expose heap memory from a privileged process running on the server.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-69395
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 1607 10.0.14393.9512, 10 1809 10.0.17763.9245
Windows Server - addressed in versions 2012 R2 6.3.9600.23397, 2012 6.2.9200.26349, 2016 10.0.14393.9512, 2019 10.0.17763.9245, 2022 10.0.20348.5622, 2025 10.0.26100.33438
Windows Server - addressed in versions 2012 R2 6.3.9600.23397, 2012 6.2.9200.26349, 2016 10.0.14393.9512, 2019 10.0.17763.9245, 2022 10.0.20348.5622, 2025 10.0.26100.33438