Microsoft has acknowledged a serious Microsoft Copilot email bug that reportedly allowed its AI system to process and summarize confidential customer emails without authorization. The issue, which persisted for weeks, has raised fresh concerns about data privacy and AI integration within enterprise software.

The Microsoft Copilot email bug highlights the growing challenges tech companies face in balancing artificial intelligence capabilities with data protection safeguards.

Microsoft Copilot Email Bug Exposed Confidential Emails

The Microsoft Copilot email bug, first reported by Bleeping Computer, allowed Microsoft’s Copilot Chat to access and summarize email content starting in January. The problem occurred even when customers had data loss prevention policies in place to block sensitive information from being processed by Microsoft’s large language models.

According to Microsoft, draft and sent email messages marked with confidential labels were incorrectly handled by Microsoft 365 Copilot chat. The company tracked the issue internally under identifier CW1226324.

Copilot Chat is an AI-powered feature available to paying Microsoft 365 users, enabling conversational assistance across Office tools such as Word, Excel, and PowerPoint. However, the Microsoft Copilot email bug allowed the system to outline the contents of sensitive communications without user consent.

Security Policies Failed to Prevent AI Processing

One of the most concerning aspects of the Microsoft Copilot email bug is that existing security safeguards did not function as intended. Organizations typically rely on data loss prevention rules to ensure sensitive communications remain protected and are not shared with AI systems.

Despite these protections, confidential emails were still processed by Copilot Chat. This raises questions about the reliability of AI governance frameworks within enterprise environments and the potential exposure of private business communications.

Microsoft has not disclosed how many customers were affected by the issue and did not provide additional details when asked for comment.

Microsoft Rolls Out Fix for Copilot Email Bug

Microsoft said it began deploying a fix for the Microsoft Copilot email bug earlier in February. The company has not specified how long the bug remained active or the full scope of impacted users.

The incident comes amid growing scrutiny over AI tools embedded in workplace software, particularly regarding how sensitive data is handled and processed by large language models.

Rising Concerns Over AI and Confidential Data

The Microsoft Copilot email bug emerges at a time when institutions worldwide are becoming increasingly cautious about AI-driven tools.

Earlier this week, the European Parliament’s IT department reportedly blocked built-in AI features on official work devices. Officials cited concerns that AI tools could upload confidential correspondence to cloud systems, potentially exposing sensitive information.

The development reflects broader unease around the rapid adoption of AI-powered workplace assistants and the risks they may pose to privacy and data security.