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CVE record · CVE-2026-61936

Windows Defender Firewall Service Security Feature Bypass Vulnerability

CVSS 5.5 MediumEPSS 0.0030 · 23rd percentile

Published by the CVE Program (CNA: microsoft) at 11 Aug 2026, 17:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Microsoft Windows 10 Version 1809
  • affected 10.0.17763.0 to before 10.0.17763.9121 custom
Microsoft Windows 10 Version 21H2
  • affected 10.0.19044.0 to before 10.0.19044.7663 custom
Microsoft Windows 10 Version 22H2
  • affected 10.0.19045.0 to before 10.0.19045.7663 custom
Microsoft Windows 11 version 23H2
  • affected 10.0.22631.0 to before 10.0.22631.7517 custom
Microsoft Windows 11 Version 23H2
  • affected 10.0.22631.0 to before 10.0.22631.7517 custom
Microsoft Windows 11 Version 24H2
  • affected 10.0.26100.0 to before 10.0.26100.9168 custom
Microsoft Windows 11 Version 25H2
  • affected 10.0.26200.0 to before 10.0.26200.9168 custom
Microsoft Windows 11 version 26H1
  • affected 10.0.28000.0 to before 10.0.28000.2704 custom
Microsoft Windows Server 2019
  • affected 10.0.17763.0 to before 10.0.17763.9121 custom
Microsoft Windows Server 2019 (Server Core installation)
  • affected 10.0.17763.0 to before 10.0.17763.9121 custom
Microsoft Windows Server 2022
  • affected 10.0.20348.0 to before 10.0.20348.5499 custom
Microsoft Windows Server 2025
  • affected 10.0.26100.0 to before 10.0.26100.33296 custom
Microsoft Windows Server 2025 (Server Core installation)
  • affected 10.0.26100.0 to before 10.0.26100.33296 custom
Identifiers
CVE-2026-61936
CNA
microsoft
Weakness (CWE)
CWE-862
Tags
Published
11 Aug 2026
Updated
10 Nov 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Windows Defender Firewall Service in multiple Windows 10, Windows 11 and Windows Server 2019 builds is affected, with the vulnerable versions listed as those before the fixed builds in each release. An attacker who already has an authorized account on the local system can bypass a security feature of the firewall service. The source gives few details. Upgrade to the fixed build for your version: 10.0.17763.9121 for Windows 10 1809 and Server 2019, 10.0.19045.7663 for Windows 10 22H2, or the matching build listed for your release.

Written 12 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.5 Medium 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.0030, the 23rd percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 11 Aug 2026, 17:04 UTC Confirmed by the CVE List

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.