CVE-2026-61936

Analyzed Analyzed - Analysis Complete

Missing Authorization in Windows Defender Firewall Service

Publication date: 2026-08-11

Last updated on: 2026-08-16

Assigner: Microsoft Corporation

Description

Missing authorization in Windows Defender Firewall Service allows an authorized attacker to bypass a security feature locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-11

Last Modified

2026-08-16

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-61936

EUVD

EUVD-2026-56340

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_10_1809	to 10.0.17763.9115 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7663 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7517 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9106 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_26h1	to 10.0.28000.2704 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9106 (exc)
microsoft	windows_server_2019	to 10.0.17763.9115 (exc)
microsoft	windows_server_2022	to 10.0.20348.5440 (exc)
microsoft	windows_server_2025	to 10.0.26100.33222 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-862	The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

Executive Summary

This vulnerability involves missing authorization in the Windows Defender Firewall Service. An authorized attacker can exploit this to bypass a security feature locally on the affected system.

Detection Guidance

This vulnerability involves missing authorization in Windows Defender Firewall Service. Detection requires checking firewall service configurations and logs for unauthorized modifications or bypass attempts. Review Windows Event Logs under 'Windows Logs > Security' for firewall-related events. Use PowerShell commands like 'Get-Service -Name mpssvc' to verify firewall service status and 'Get-NetFirewallRule' to inspect firewall rules for anomalies.

Impact Analysis

An attacker could bypass firewall protections locally, potentially allowing unauthorized network access or disabling security controls on your system.

Compliance Impact

This vulnerability allows an authorized attacker to bypass a security feature locally, which could undermine security controls required for compliance with standards like GDPR or HIPAA. Missing authorization in Windows Defender Firewall Service may lead to unauthorized access or data exposure, potentially violating regulatory requirements for data protection and access control.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows Defender Firewall Service authorization flaw.

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