Microsoft Copilot may leak secrets via indirect prompt injection, report says
An article warns that Microsoft Copilot could be exploited through indirect prompt injection, where attackers hide malicious instructions in webpages or documents to exfiltrate confidential data without user awareness. The vulnerability leverages Copilot’s ability to access external content and internal files like SharePoint or OneDrive, potentially sending sensitive information to attacker…
Key points
- Copilot can be tricked via hidden prompts in files or webpages to leak data
- Attackers can exfiltrate SharePoint or OneDrive files using image URL disguise
- No user-visible signs indicate the data theft is happening
[AI Spy] Are secrets disappearing from Copilot? The ironclad defense measures you must take right now
note.com · 5 October 2026
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