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Microsoft 365 Bug Exposes Confidential Emails, Fix Underway

3/2/2026

29 5 Full Breakdown

Summary

Story summary

A bug in Microsoft 365 Copilot allowed the AI assistant to summarize confidential emails, bypassing Data Loss Prevention (DLP) policies.
Microsoft began deploying a fix after late January and has not disclosed how many organizations were affected.
Security experts urge companies to reassess their AI integration with compliance controls.
Users should review Copilot access settings, validate DLP policies, and monitor activity logs to protect data.

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Story summary

A bug in Microsoft 365 Copilot allowed the AI assistant to summarize confidential emails, bypassing Data Loss Prevention (DLP) policies.
Microsoft began deploying a fix after late January and has not disclosed how many organizations were affected.
Security experts urge companies to reassess their AI integration with compliance controls.
Users should review Copilot access settings, validate DLP policies, and monitor activity logs to protect data.