microsoft 365 copilot

Johann Rehberger's DEF CON Singapore research demonstrates how indirect prompt injection chains into Microsoft Copilot's memory feature to plant a persistent backdoor — one that survives across every future session, not just the compromised one.

Varonis Threat Labs chained three bugs in Microsoft 365 Copilot Enterprise Search to build a one-click exfiltration path that pulls emails, files, and live MFA codes without any OAuth prompt or user consent beyond clicking a Microsoft-domain URL.