How ‘Reprompt’ Attack Let Hackers Steal Data From Microsoft Copilot

Varonis found a “Reprompt” attack that let a single link hijack Microsoft Copilot Personal sessions and exfiltrate data; Microsoft patched it in January 2026.

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How a simple link allowed hackers to bypass Copilot's security guardrails - and what Microsoft did about it

Reprompt impacted Microsoft Copilot Personal and, according to the team, gave "threat actors an invisible entry point to perform a data‑exfiltration chain that bypasses enterprise security controls ...

You probably shouldn’t click that email ‘unsubscribe’ link. Here’s what to do instead

It's tempting to click on "unsubscribe" to defend yourself from spam emails. But that can sometimes make things worse. Here's ...
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Thank you to our sponsor Readdy.ai for helping to bring you this video. --- Wondering how to create a website with AI in 2025 ...

One click is all it takes: How ‘Reprompt’ turned Microsoft Copilot into a data exfiltration tool

A new one-click attack flow discovered by Varonis Threat Labs researchers underscores this fact. ‘Reprompt,’ as they’ve ...