Microsoft Copilot Spills Trade Secrets Leading to Data Exfiltration Hack

By Dan Goodin · Ars Technica · 2026-08-18

Ars Technica reports that security firm Varonis successfully manipulated Microsoft 365 Copilot Enterprise into revealing an undocumented prompt parameter. By asking the assistant to describe its own safety guardrails, researchers discovered a hidden bypass that allowed them to ex

Ars Technica reports that security firm Varonis successfully manipulated Microsoft 365 Copilot Enterprise into revealing an undocumented prompt parameter. By asking the assistant to describe its own safety guardrails, researchers discovered a hidden bypass that allowed them to ex