Microsoft Copilot and data security: are your controls keeping up?

TL;DR: Microsoft Copilot can surface sensitive content already reachable through Microsoft 365 permissions, which makes over-permissioning, weak classification, and limited audit visibility core data security risks according to Netwrix. The governance problem is not the model itself but the access estate it inherits, where existing identity and data controls decide what Copilot can expose.

NHIMG editorial — based on content published by Netwrix: Microsoft Copilot and Data Security: Risks and Best Practices

By the numbers:

• When AWS credentials are exposed publicly, attackers attempt access within an average of 17 minutes and as quickly as 9 minutes in some cases.

Questions worth separating out

Q: How should security teams govern Copilot access in Microsoft 365?

A: Treat Copilot as a visibility multiplier on top of existing permissions.

Q: Why does Copilot increase the impact of poor data classification?

A: Because Copilot depends on the labels and access controls already present in the tenant.

Q: What breaks when organisations rely on traditional file access logs for AI-assisted work?

A: They miss the prompt context that explains why a disclosure happened.

Practitioner guidance

• Audit Microsoft 365 permissions before expanding Copilot Review SharePoint, OneDrive, Teams, and Exchange entitlements for users who can access confidential repositories, then remove broad access that is not tied to a clear business need.
• Validate sensitivity label coverage across priority repositories Check whether regulated, confidential, and IP-bearing content is consistently labelled across collaboration workloads.
• Add prompt and retrieval telemetry to audit workflows Make sure security operations can reconstruct prompt, retrieval, and output events when investigating AI-assisted disclosures.

What's in the full article

Netwrix's full blog post covers the operational detail this post intentionally leaves for the source:

• Step-by-step permission hygiene guidance across Microsoft 365 repositories and collaboration workloads.
• Practical examples of sensitivity labelling and DLP configuration for Copilot-ready environments.
• Monitoring and audit workflow options for tracking AI-assisted access and anomaly detection.
• Implementation context for Netwrix 1Secure DSPM and how it maps to Microsoft 365 data exposure.

👉 Read Netwrix's analysis of Microsoft Copilot data security risks and best practices →

Microsoft Copilot and data security: are your controls keeping up?

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