CVE-2026-28415: Gradio has Open Redirect in OAuth Flow

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-27 · updated 2026-06-17
Weakness: CWE-200

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.

Affected products

gradio-app gradio: before 6.6.0 — fixed in 6.6.0

How to fix

Upgrade to a fixed version: gradio-app gradio 6.6.0. Check the vendor advisory for mitigations.

References

https://github.com/gradio-app/gradio/security/advisories/GHSA-pfjf-5gxr-995x

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