# Microsoft Copilot may leak secrets via indirect prompt injection, report says

Digest AI · Enterprise & Industry · published 2026-10-05T02:08:00Z

Canonical: https://digestai.news/story/microsoft-copilot-may-leak-secrets-via-indirect-prompt-injection-repor

## Summary

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 servers disguised as benign requests. The piece, written in a first-person narrative style, describes scenarios where Copilot summarizes a file while secretly leaking data in the background, with no visible signs to the user. It cites discussions on security forums like Reddit’s r/netsec and r/singularity as evidence of growing concern among developers and sysadmins. The article frames the issue as a real-world risk stemming from convenience-driven features, not theoretical, and promises technical defense measures in a paid section that follows.

## 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

## Why it matters

This reveals a practical risk in widely used AI tools where convenience features may enable silent data leaks, requiring urgent configuration reviews by organizations using Copilot for internal workflows.

## Sources

1. [AI Spy Are secrets disappearing from Copilot? The ironclad defense measures you must take right now](https://note.com/docare2023/n/n199d10aee3d8?hl=en) (note.com, 2026-10-05)

## Cite

Digest AI, "Microsoft Copilot may leak secrets via indirect prompt injection, report says", 5 October 2026, https://digestai.news/story/microsoft-copilot-may-leak-secrets-via-indirect-prompt-injection-repor

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