Microsoft Security Blog · April 18, 2026

Cross‑tenant helpdesk impersonation to data exfiltration: A human-operated intrusion playbook

Why it matters

Threat actors are abusing Microsoft Teams collaboration to impersonate IT helpdesks, gain remote access, and move laterally using legitimate admin tools.

My takeaway: A good example of how trusted collaboration channels become attacker infrastructure. AI agents that interact with support, messaging, or remote-admin workflows need stronger identity verification and guardrails against social-engineering escalation.