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Microsoft 365 Copilot Vulnerability Exposes Sensitive Emails Through AI Summaries

Gbhackers •Divya • February 19, 2026

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Microsoft 365 Copilot Bug Exposes Confidential Emails to AI Summarization Microsoft confirmed a bug in its Copilot AI that allowed unauthorized summarization of customers' confidential emails from late January 2026. The issue affected Microsoft 365 users, bypassing data loss prevention policies designed to protect sensitive information. The bug was first detected on January 21 and involved emails in users' Sent Items and Drafts folders. 13 sources 38

Extracted Entities

Microsoft 365 Copilot Vulnerability Exposes Sensitive Emails Through AI Summaries

The full story

Extracted Entities

Attack Types (2)

Companies (1)

Platforms (1)