How did Copilot expose confidential emails?
What went wrong with Microsoft 365 Copilot
A software defect allowed the assistant functionality in a major productivity suite to summarize emails that should have been protected. The bug affected messages stored in draft and sent folders and bypassed controls designed to block sensitive content from being read and processed by the assistant.
Immediate outcomes
- Microsoft verified the issue and rolled out a fix, with the company saying the problematic behavior began in late January and was corrected in early February.
- The flaw undermined established data‑loss prevention (DLP) safeguards by letting the assistant access and summarize content that organizations expected to remain off limits to AI processing.
Why this matters
Confidential business communications often contain intellectual property, financial details and regulated personal data. A tool that can ingest those messages and produce summaries creates both operational risk and compliance exposure for enterprises that rely on DLP and contractual data‑handling guarantees.
Practical steps organizations should take
- Confirm deployment status and ensure vendor fixes and patches are applied.
- Re‑audit DLP rules and AI‑integration settings to enforce explicit exclusions.
- Review logs and access records for anomalous assistant activity during the affected window.
- Rotate or revoke exposed credentials, and notify stakeholders where required by policy or law.
Longer term, this episode underscores the need for stricter separation between automated assistants and sensitive data stores, clearer configuration defaults, and stronger transparency from vendors about AI integrations inside productivity platforms.