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CVE-2026-56181

nvd nist
Published: Jul 14, 2026Modified: Jul 22, 2026

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8.3
Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploitability: 1.6 / Impact: 6.0
Source: secure@microsoft.com (Secondary)

Description

Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.

Affected (4)

Microsoft
4 products
Windows 11 24h2
Windows 11 25h2
Windows 11 26h1
Windows Server 2025
Configuration A
4 vulnerable
Vulnerable SoftwareAffected Versions
Windows 11 24h2
Before 10.0.26100.8875
Windows 11 25h2
Before 10.0.26200.8875
Windows 11 26h1
Before 10.0.28000.2525
Windows Server 2025
Before 10.0.26100.33158

Related CWEs

CWE-346
Origin Validation Error
The product does not properly verify that the source of data or communication is valid.

References (1)

Source: secure@microsoft.com
PatchVendor Advisory

Timeline

No history available yet.