Malicious Chrome Extension Compromises Chats of 900,000 Users

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Malicious Chrome Extension Compromises Chats of 900,000 Users

First seen 7 Jan 2026, 10:41 UTC • •25.4

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ThreatCluster •March 12, 2026 at 13:27 UTC

A malicious Chrome extension has leaked chat data from ChatGPT and DeepSeek, affecting approximately 900,000 users. The extension exploited a vulnerability to access private conversations, raising significant privacy concerns. Users are advised to remove the extension immediately and monitor their accounts for suspicious activity.

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Threat Graph

6 entities, 5 inferred relationships (STIX 2.1).

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Technique (2)

Data Breach
Malware

Affected Platform (2)

ChatGPT
Chrome Extension

Tool (2)

DeepSeek
Chrome

Relationships

Data Breach targets ChatGPT
Data Breach targets Chrome Extension
Malware targets ChatGPT
Malware targets Chrome Extension
DeepSeek related to Chrome

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