KB5129195

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First seenSep 17, 2026
Last mentionedSep 17, 2026

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Windows 11 KB5124008 Update Breaks Active Directory Domain Trust and Blocks User Logins

Microsoft's September Windows 11 cumulative update KB5124008 breaks Active Directory domain trust on domain-joined machines, blocking logins despite valid credentials.

Cyber Security NewsSep 17, 00:29 UTC · Sep 17, 2026Vulnerability1

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Credential Guardproduct · 1
Windows 11product · 1
Microsoftvendor · 1
Active Directoryproduct · 1
Microsoftorganization · 1
KB5124008product · 1

Entities are extracted by the model from each article. First seen Sep 17, 2026, last mentioned Sep 17, 2026. Watching keeps it in this browser only (no account); the watchlist page and dashboard alerts use it.