Open Redirect in Gradio-App Gradio
CVE-2026-28415
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.
Vulnerability class: Information Disclosure
EPSS: 0.002 (14.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
Affected products
- Gradio-app Gradio — versions < 6.6.0
- Gradio_project Gradio
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-28415?
- CVE-2026-28415 is a medium-severity vulnerability in Gradio-App Gradio, classified under Information Disclosure. CVSS score: 4.3/10. Published 2026-02-27.
- How severe is CVE-2026-28415?
- Medium severity. CVSS v3 base score is 4.3 out of 10.