CVE-2026-28415

Medium

Description

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.

SeverityMedium

CVSS4.3

Exploit probability—

ProductGradio

PublishedFeb 27, 2026

First seenFeb 27, 2026

Weakness typeCWE-200Sensitive information exposure CWE-284Improper access control CWE-330CWE-330 CWE-601Open redirect

How to fix

Update

gradio_project gradio6.6.0 or later
gradio6.6.0 or later

Affected products

Product	Affected versions	Fixed in
gradio_project gradio	v < 6.6.0	6.6.0
gradioPyPI	v < 6.6.0	6.6.0

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