Chrome Extension Monitors AI Conversations Across ChatGPT, Claude, Gemini, and Other Platforms

Cybersecuritynews •Guru Baran • July 28, 2026

A Chrome extension with roughly 100,000 installs is quietly harvesting every prompt and AI response typed across nine major artificial intelligence platforms. Despite its official listing and explicitly claiming zero personal data collection, the extension “Prompt Optimizer – SecondBrain” (ID: aajjgdpofhhcjmjoombjdfepplndhgcp, version 2.3.1) is actively capturing user interactions across ChatGPT, Claude, Gemini, Grok, […]

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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.

Chrome Extension Steals AI Prompts from 100k Users Across Multiple Platforms A Chrome extension named 'Prompt Optimizer - SecondBrain' has been found to collect user prompts and AI responses without user interaction. The extension, which has approximately 100,000 installations, operates silently on nine AI platforms, including ChatGPT and Claude. It captures data by running a capture engine at document_start and sending POST requests to a vendor endpoint. Despite claiming no data collection in its privacy declaration, the extension has been confirmed to store user credentials and transmit sensitive information. Users are at risk of their AI interactions being harvested without consent. The extension's malicious behavior was reproduced on a clean profile without any direct user engagement. Security researchers are currently investigating the implications of this extension. 2 sources 66

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Chrome Extension Monitors AI Conversations Across ChatGPT, Claude, Gemini, and Other Platforms

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