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Gradio, a Python package for building web interfaces, has a security flaw in versions 4.16.0 through 6.5.x where it automatically enables fake OAuth routes (authentication shortcuts) that accidentally expose the server owner's Hugging Face access token (a credential used to authenticate with Hugging Face services) to anyone who visits the login page. An attacker can steal this token because the session cookie (a small file storing login information) is signed with a hardcoded secret, making it easy to decode.