Microsoft Says Bug Causes Copilot To Summarize Confidential Emails

Source: Slashdot

Bug Overview

Microsoft has identified a bug in Microsoft 365 Copilot that has been summarizing confidential emails since late January. The issue bypasses data loss prevention (DLP) policies that organizations rely on to protect sensitive information.

Affected Feature

The bug (tracked under CW1226324 and first detected on January 21) impacts the Copilot “work tab” chat feature. It incorrectly reads and summarizes emails stored in users’ Sent Items and Drafts folders, including messages that carry confidentiality labels explicitly designed to restrict access by automated tools.

Timeline and Rollout

Copilot Chat (short for Microsoft 365 Copilot Chat) is the company’s AI‑powered, content‑aware chat that lets users interact with AI agents. Microsoft began rolling out Copilot Chat to Word, Excel, PowerPoint, Outlook, and OneNote for paying Microsoft 365 business customers in September 2025.

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