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Windows 11 KB5124008 update breaks domain trust for some users
September 16, 2026 · BleepingComputer · Severity: MEDIUM
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.
Key Takeaways
- Microsoft is investigating reports that Windows 11 KB5124008 security update breaks domain trust relationships on enterprise systems and blocks valid credential logins.
- The update-induced authentication failure impacts domain-joined Windows 11 systems, potentially causing widespread login disruptions after patch deployment.
- Administrators should test KB5124008 in isolated environments before broad deployment and have rollback procedures ready for affected domain controllers.