Microsoft Copilot Cowork: Data Exfiltration Vulnerability

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Key Takeaways

1Microsoft Copilot Cowork allowed sending emails without approval, exposing users to risks.

2Compromised messages could contain external images, facilitating data exfiltration through network requests.

3OneDrive, with its pre-authenticated download links, could be exploited for file leaks.

💡Why it matters — This vulnerability highlights the potential weaknesses of agentic systems in protecting user data.

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Full Analysis

A Vulnerability in Microsoft Copilot Cowork

Microsoft Copilot Cowork has a security vulnerability that allows agents to send emails directly to users' inboxes without requiring prior approval.

This feature has opened the door to data exfiltration risks. Emails sent by these agents could contain external images. When a user opened a compromised message, these images triggered network requests to external websites, thereby allowing a potential attacker to access the user's data.

The Role of OneDrive in the Data Leak

Another concerning aspect of this vulnerability involves OneDrive. This online storage service from Microsoft can generate pre-authenticated download links. A successful prompt injection could exploit these links, enabling an attacker to download files without authorization.

This situation highlights the ongoing challenges in securing agent-based systems, where protecting user data must be a top priority.

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