tech

February 18, 2026

Microsoft says Office bug exposed customers' confidential emails to Copilot AI

Microsoft said the bug meant that its Copilot AI chatbot was reading and summarizing paying customers' confidential emails, bypassing data protection policies.

Microsoft says Office bug exposed customers' confidential emails to Copilot AI

TL;DR

  • A bug in Microsoft's Copilot AI enabled it to summarize confidential customer emails without permission.
  • The bug allowed Copilot Chat to read and outline email contents since January, overriding data loss prevention policies.
  • This issue impacted draft and sent emails with a 'confidential' label.
  • Microsoft has begun deploying a fix for the bug, tracked as CW1226324.
  • The European Parliament's IT department had previously blocked built-in AI features on work devices due to similar confidentiality concerns.

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