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Windows 11 KB5124008 update breaks domain trust for some users

Microsoft is investigating Windows 11 KB5124008 breaking Active Directory domain trust, leaving some users unable to log in with valid credentials.

Administrators report the Windows 11 KB5124008 security update breaks the secure channel between domain-joined machines and Active Directory, causing login failures on Windows 11 25H2 systems after reboot. The failures are linked to the Machine Identity Isolation feature, which in enforcement mode moves machine account secrets into Credential Guard and removes the LSA copy; one admin saw 11 of roughly 256 devices affected. Workarounds include setting MachineIdentityIsolation to 0 and repairing the secure channel with Test-ComputerSecureChannel, though Microsoft has confirmed no root cause or official fix and warns disabling the feature can also break domain authentication.

BleepingComputerupdated · 15m agofirst · 4h agoVulnerability 2 sources

Webinar: What happens in the first hours of a Google Workspace breach

BleepingComputer and Material Security will host a September 23 webinar analyzing first-hours response decisions in real Google Workspace breaches.

The September 23, 2026 webinar 'Breach autopsy' features Material Security VP of Security Rajan Kapoor and Fireside Consulting president Rick Fitzgerald examining publicly documented Google Workspace breaches. Two analyzed attacks combined social engineering with malicious OAuth applications to gain access. Sessions will cover scoping exposed users and data, confirming whether attacker access persists, and which early containment decisions limited or worsened impact for lean security teams.

BleepingComputer · 12h agoIndustry