Microsoft January 2026 Security Update Triggers Credential Prompt Failures in Remote Desktop
ID: 60fa833e-94ca-59ea-b88f-6ef89be2acd5
STIX ID: report--60fa833e-94ca-59ea-b88f-6ef89be2acd5
Feed Name: GBHackers
Threat Score
Microsoft's January 2026 security update (KB5074109) introduced an authentication regression on certain Windows 11 builds that caused immediate Remote Desktop sign‑in failures for Azure Virtual Desktop and Windows 365 users, producing “Unable to Authenticate” and 0x80080005 errors; the issue affected multiple Windows versions and enterprise virtual desktop environments, prompting Microsoft to release emergency remediation patches (notably KB5077744) to restore connectivity while retaining the January security fixes.
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