Hackers Pose as IT Support to Hijack Microsoft 365 Accounts With Fake Passkey Alerts

Threat actors are impersonating corporate IT helpdesk staff in an active social-engineering campaign that hijacks Microsoft 365 identities, establishes MFA persistence, and systematically collects data from SharePoint, OneDrive, and Exchange Online. Microsoft Security Research said it has observed the cloud-focused intrusions since May 2026. The...