CVE-2026-28415
Received Received - Intake
Open Redirect in Gradio OAuth _redirect_to_target() Function

Publication date: 2026-02-27

Last updated on: 2026-03-05

Assigner: GitHub, Inc.

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.
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Meta Information
Published
2026-02-27
Last Modified
2026-03-05
Generated
2026-06-16
AI Q&A
2026-02-28
EPSS Evaluated
2026-06-15
NVD
CVE-2026-28415
EUVD
EUVD-2026-9083
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
gradio_project gradio to 6.6.0 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-330 The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CWE-601 The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.
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Executive Summary

This vulnerability exists in the Gradio Python package prior to version 6.6.0. The function _redirect_to_target() in Gradio's OAuth flow accepts a _target_url query parameter without proper validation. This allows an attacker to redirect users to arbitrary external URLs through the /logout and /login/callback endpoints on Gradio apps that have OAuth enabled.

Starting with version 6.6.0, the _target_url parameter is sanitized to only allow the path, query, and fragment components, removing any scheme or host information to prevent such arbitrary redirections.

Impact Analysis

This vulnerability can lead to open redirect attacks, where users of affected Gradio applications may be redirected to malicious external websites without their consent.

Such redirections can be exploited for phishing attacks, tricking users into providing sensitive information or downloading malware, thereby compromising user trust and security.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, upgrade Gradio to version 6.6.0 or later, where the _target_url parameter is properly sanitized to prevent redirection to arbitrary external URLs.

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