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Copilot ‘reprompt vulnerability’ could allow it to leak sensitive data via plugins – January 2026

Author/Source: Liam Tung, Staff Writer See the full link here

Takeaway

This article explains a security flaw found in AI assistants like Microsoft’s Copilot. This flaw, called a ‘reprompt vulnerability’, could allow these AI tools to accidentally share private information when using extra features called plugins.


Technical Subject Understandability

Intermediate


Analogy/Comparison

Imagine you have a very helpful personal assistant who usually only tells you what you ask for. This vulnerability is like if someone could trick your assistant into accidentally spilling a secret they heard, just by asking a series of tricky questions.


Why It Matters

This issue is important because it means AI assistants could unintentionally reveal sensitive business data, like details from company emails or documents, to unauthorized people. This could lead to big privacy problems for companies using these AI tools. Microsoft has already released a fix for its Copilot for Microsoft 365 to protect its users.


Related Terms

reprompt vulnerability, plugin, LLM. Jargon Conversion: A reprompt vulnerability is a weakness where an AI can be tricked into sharing private information by cleverly worded or repeated questions. A plugin is an extra tool that lets an AI connect with other apps and services. An LLM, or Large Language Model, is the computer program that powers AI assistants and lets them understand and create human language.

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