Claude Desktop Exposed to Write Backdoor Files to Chromium Browser During Installation

According to 23pds (@im23pds), Chief Information Security Officer (CISO) at SlowMist, Anthropic’s Claude Desktop application writes a special file to all Chromium-based browsers on a user’s computer during installation—without the user’s knowledge or consent. This file effectively functions as a pre-authorized backdoor; when combined with a specific browser extension, attackers can gain full control over the user’s browser.