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Researchers find ‘reprompt vulnerability’ in Microsoft Copilot that could let it steal your data – January 2026

Author/Source: Liam Tung See the full link here

Takeaway

This article explains a security flaw in Microsoft Copilot called a “reprompt vulnerability.” You’ll learn how this flaw could allow someone to trick the AI into giving away your private information.


Technical Subject Understandability

Intermediate


Analogy/Comparison

Imagine you tell your smart assistant to do something simple, but a sneaky message hidden in your request secretly tells it to also whisper your private diary entries to a stranger.


Why It Matters

This issue is important because it could lead to your personal information, like past conversations or sensitive data, being stolen. For example, researchers showed how a bad website could trick Copilot into sending a user’s private data to an attacker.


Related Terms

Reprompt vulnerability, prompt injection, LLM, Copilot, data exfiltration. Jargon Conversion: A reprompt vulnerability is a weakness that lets someone trick an AI into revealing private information. Prompt injection means giving an AI a tricky command to make it do something it shouldn’t. LLM stands for Large Language Model, which is the type of AI that understands and generates human language. Copilot is Microsoft’s AI assistant. Data exfiltration means secretly sending private information from a computer or AI to an attacker.

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