Local firewall security-feature bypass
Published Aug 11, 2026 · Updated Aug 25, 2026
Missing authorization in Windows Defender Firewall Service in Microsoft Windows allows local users to bypass firewall protections. Microsoft has not disclosed the affected authorization check, the operation it fails to protect, or how crafted local input reaches that check. Exploitation requires a low-privileged local account and can compromise firewall-policy integrity without reported data disclosure or service interruption.
Summary
What happened
Missing authorization in Windows Defender Firewall Service in Microsoft Windows allows local users to bypass firewall protections. Microsoft has not disclosed the affected authorization check, the operation it fails to protect, or how crafted local input reaches that check. Exploitation requires a low-privileged local account and can compromise firewall-policy integrity without reported data disclosure or service interruption.
The record
- CVE
- CVE-2026-61936
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-862, T1686.003
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.9121
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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