Claude Desktop was exposed for secretly writing a backdoor file in the browser

By: rootdata|2026/04/21 00:42:00

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According to Slow Fog CISO @im23pads's post on the X platform, Claude Desktop has been reported to secretly write a backdoor file into browsers. When users install the Claude Desktop application, it writes a special file to all Chromium-based browsers on the computer without the user's knowledge.

This file acts as a pre-authorized backdoor, which, when used in conjunction with specific browser extensions, can gain complete control over the user's browser.

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