Search/CVE-2026-56179
● CVE — High

CVE-2026-56179

VendormicrosoftProductwindows 11 24h2, windows 11 25h2, windows 11 26h1, windows server 2025DiscoveredAug 11, 2026UpdatedAug 13, 2026

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

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CVSS v3.1
8.3 HIGH
EPSS
0.28%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
1
sources referencing this CVE
Related IOCs
0
seen in the same coverage
Intelligence Reports6
6 intelligence reports available

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EPSS Trend
Aug 14, 2026 → Sep 25, 2026
▲ 0.04pp
0.23% → 0.28% over 2 tracked changes
CVSS v3.1 Detail
Attack VectorADJACENT
Attack ComplexityHIGH
Privileges RequiredNONE
User InteractionNONE
ScopeCHANGED
ConfidentialityHIGH
IntegrityHIGH
AvailabilityHIGH
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Connections
6 relationships
Timeline
disclosure → media coverage
Aug 11, 2026
Disclosure — published as a CVE record.
Aug 11, 2026
advisories.ncsc.nl reports: NCSC-2026-0284 [1.00] [M/H] Kwetsbaarheden verholpen in Microsoft Windows