Auth bypass in Microsoft Windows 10 Version 1607
CVE-2026-69640
Incorrect authorization in Windows Key Distribution Center allows an authorized attacker to bypass a security feature over a network.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Microsoft Windows 10 Version 1607
- Microsoft Windows 10 Version 1809
- 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 R2
- Microsoft Windows Server 2012 R2 (Server Core Installation)
- Microsoft Windows Server 2012 (Server Core Installation)
Weakness classification (CWE)
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69640 (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-69640?
- CVE-2026-69640 is a medium-severity vulnerability in Microsoft Windows 10 Version 1607, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2026-10-13.
- How severe is CVE-2026-69640?
- Medium severity. CVSS v3 base score is 5.3 out of 10.