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Copilot ‘steal data’ reprompt vulnerability: Microsoft says it’s fixed – January 2026

Author/Source: Large language models are computer programs that can understand and generate human-like text. Prompt injection is a way to trick these programs into doing things they shouldn’t. A reprompt is when you ask the program to answer again in a different way. See the full link here

Takeaway

This article discusses a security problem in Microsoft’s Copilot, where someone could trick it into revealing information it shouldn’t. Microsoft says they have fixed this issue.


Technical Subject Understandability

Intermediate


Analogy/Comparison

It’s like asking a librarian for a specific book, but the librarian accidentally gives you a secret document from the restricted section.


Why It Matters

This is important because if Copilot gave away sensitive information, it could lead to data breaches or privacy violations. For example, a company’s internal financial documents could be exposed.


Related Terms

Large language models, prompt injection, reprompt

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