Malicious Browser Add-Ons Target ChatGPT, Claude, Copilot, Gemini, and DeepSeek Users

Cybersecuritynews •Tushar Subhra Dutta • June 5, 2026

Millions of people now use AI platforms like ChatGPT, Claude, Copilot, Gemini, and DeepSeek every single day, sharing personal thoughts, work documents, and sensitive data without a second thought. That trust, it turns out, is being quietly exploited. A growing wave of malicious Google Chrome extensions is secretly harvesting those conversations and sending them off […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Malicious Browser Add-Ons Exploit AI Platform Users Malicious browser add-ons are targeting users of popular AI platforms such as ChatGPT, Claude, Copilot, Gemini, and DeepSeek. These extensions masquerade as helpful tools but are actually harvesting personal data and chat histories. Millions of users are affected, as these add-ons intercept interactions with generative AI models. The attack method involves leveraging seemingly benign Chrome extensions that operate in the background to exfiltrate sensitive information. The scope of the impact is significant, given the widespread use of these AI platforms daily. Current analysis indicates a growing trend in such malicious activities, raising alarms among cybersecurity experts. Users are advised to be cautious and review their installed extensions for potential threats. 2 sources 68

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Malicious Browser Add-Ons Target ChatGPT, Claude, Copilot, Gemini, and DeepSeek Users

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Attack Types (1)

MITRE ATT&CK (1)

Platforms (2)

Tools (4)