US EditionA Single Click Mounted a Covert, Multistage Attack Against Copilot
Varonis revealed that Reprompt exploits authenticated Copilot Personal sessions to stealthily exfiltrate data via chained requests, with Microsoft patching the vulnerability in January 2026.
9 Articles
9 Articles
Researchers have uncovered a new attack method that can be performed with one click and bypasses Microsoft Copilot security controls, allowing for the unauthorized capture of user data.
A single click mounted a covert, multistage attack against Copilot
Microsoft has fixed a vulnerability in its Copilot AI assistant that allowed hackers to pluck a host of sensitive user data with a single click on a legitimate URL. The hackers in this case were white-hat researchers from security firm Varonis. The net effect of their multistage attack was that they exfiltrated data, including the target’s name, location, and details of specific events from the user’s Copilot chat history. The attack continued t…
A new threat is emerging for Windows. Researchers at Varonis have discovered a new security vulnerability in Microsoft Copilot. It allows attackers to siphon your data without your knowledge…
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