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.

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

Published 2026-02-27 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.003 (19.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.000

Affected products

Gradio-App Gradio — versions < 6.6.0
Gradio Project

Weakness classification (CWE)

References

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