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Vulnerability record · CVE-2026-56179 · published 11 August 2026

CVE-2026-56179: Microsoft windows 11 24h2 origin validation error vulnerability

Microsoft · Windows 11 24h2

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

8.3 CVSS 3.1 High EPSS 0.28% · top 82.0% CWE-346 · Origin validation error
8.3CVSS 3.1 base score
0.28%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
1References
13 Aug 2026Last modified by NVD

Description

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

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56179 PatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-56179), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.