Claude Desktop secretly writes into browser backdoor files

ChainCatcher message, according to SlowMist CISO @im23pads’ post on the X platform, revealed that Claude Desktop was reported to secretly write a browser backdoor file. When users install the Claude Desktop application, the app will, without the user’s knowledge, write a special file into all browsers on the computer that are based on the Chromium engine.

This file is effectively a pre-authorized backdoor; once used together with a specific browser extension, it can provide full control over the user’s browser.

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