CVE-2026-28415
MEDIUM
GHSA-pfjf-5gxr-995x
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Lifecycle Timeline
3Description
Gradio is an open-source Python package designed for quick prototyping. Prior to version 6.6.0, the _redirect_to_target() function in Gradio's OAuth flow accepts an unvalidated _target_url query parameter, allowing redirection to arbitrary external URLs. This affects the /logout and /login/callback endpoints on Gradio apps with OAuth enabled (i.e. apps running on Hugging Face Spaces with gr.LoginButton). Starting in version 6.6.0, the _target_url parameter is sanitized to only use the path, query, and fragment, stripping any scheme or host.
Analysis
Open redirect in Gradio's OAuth implementation allows unauthenticated attackers to redirect users to arbitrary external URLs through the unvalidated _target_url parameter on /logout and /login/callback endpoints in applications with OAuth enabled. This affects Gradio versions prior to 6.6.0 running on Hugging Face Spaces with gr.LoginButton, enabling phishing attacks or credential theft. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Review data exposure and access controls.
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