Executive Summary

Microsoft is investigating reports that the Windows 11 KB5124008 security update is breaking domain trust relationships on some enterprise systems, preventing users from logging in with valid domain credentials. The issue affects domain‑joined PCs, causing authentication failures and potential downtime. Microsoft has acknowledged the problem and is working on a fix.

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Intelligence Metadata - Source Publisher: Bleeping Computer - Published Date: 2026-09-16T20:39:29+00:00 - Category: vulnerabilities

Original Description: Microsoft is investigating reports that the Windows 11 KB5124008 security update is breaking domain trust relationships on some enterprise systems, preventing users from logging in with valid domain credentials. [...]

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