Auth bypass in Microsoft Windows 10 Version 1809
CVE-2026-61936
Missing authorization in Windows Defender Firewall Service allows an authorized attacker to bypass a security feature locally.
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Microsoft Windows 10 Version 1809 — versions 10.0.17763.0
- Microsoft Windows 10 Version 21h2 — versions 10.0.19044.0
- Microsoft Windows 10 Version 22h2 — versions 10.0.19045.0
- Microsoft Windows 11 Version 23h2 — versions 10.0.22631.0
- Microsoft Windows 11 Version 24h2 — versions 10.0.26100.0
- Microsoft Windows 11 Version 25h2 — versions 10.0.26200.0
- Microsoft Windows 11 Version 26h1 — versions 10.0.28000.0
- Microsoft Windows Server 2019 — versions 10.0.17763.0
- Microsoft Windows Server 2019 (Server Core Installation) — versions 10.0.17763.0
- Microsoft Windows Server 2022 — versions 10.0.20348.0
Weakness classification (CWE)
References
- Windows Defender Firewall Service Security Feature Bypass Vulnerability (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-61936?
- CVE-2026-61936 is a medium-severity vulnerability in Microsoft Windows 10 Version 1809, classified under Missing Authorization. CVSS score: 5.5/10. Published 2026-08-11.
- How severe is CVE-2026-61936?
- Medium severity. CVSS v3 base score is 5.5 out of 10.