Microsoft 365 Copilot answers from whatever the signed-in user can already access. That's the whole security model — and the whole problem. Years of 'share with everyone to make it easy' means many firms have files sitting open to the entire company without anyone remembering.
Before Copilot, that oversharing was invisible because nobody went looking. After Copilot, a simple prompt can surface a salary sheet, a client matter, or a deal memo to anyone with a license. Copilot didn't break your permissions; it exposed them.
The move this weekRun an oversharing review before enabling Copilot for a broader group. Identify sites and folders shared to "Everyone", tighten them to the people who actually need access, and only then widen the rollout. Governance first, magic second.
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