Auth bypass in Microsoft Windows 10 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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (20.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Microsoft Windows 10 1809
- Microsoft Windows 10 21h2
- Microsoft Windows 10 22h2
- 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 23h2
- Microsoft Windows 11 24h2
- Microsoft Windows 11 25h2
- Microsoft Windows 11 26h1
Weakness classification (CWE)
References
- Windows Defender Firewall Service Security Feature Bypass Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-61936?
- CVE-2026-61936 is a medium-severity vulnerability in Microsoft Windows 10 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.