GHSA-PFJF-5GXR-995X

Vulnerability from github – Published: 2026-03-01 01:29 – Updated: 2026-06-06 00:22
VLAI
Summary
Gradio has an Open Redirect in its OAuth Flow
Details

Summary

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).

Details


  def _redirect_to_target(request, default_target="/"):
      target = request.query_params.get("_target_url", default_target)
      return RedirectResponse(target)  # No validation

An attacker can craft a URL like https://my-space.hf.space/logout?_target_url=https://evil.com/phishing that redirects the user to an external site after logout. Because the URL originates from a trusted hf.space domain, users are more likely to trust the link.

Impact

Phishing — an attacker can use the trusted domain to redirect users to a malicious site. No direct data exposure or server-side impact.

## Fix The _target_url parameter is now sanitized to only use the path, query, and fragment, stripping any scheme or host.

Severity
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "gradio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.6.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-28415"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-284",
      "CWE-330",
      "CWE-601"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-01T01:29:12Z",
    "nvd_published_at": "2026-02-27T22:16:24Z",
    "severity": "MODERATE"
  },
  "details": "# Summary\n\nThe _redirect_to_target() function in Gradio\u0027s 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).\n\n## Details\n\n```python\n\n  def _redirect_to_target(request, default_target=\"/\"):\n      target = request.query_params.get(\"_target_url\", default_target)\n      return RedirectResponse(target)  # No validation\n```\n  An attacker can craft a URL like https://my-space.hf.space/logout?_target_url=https://evil.com/phishing that redirects the user to an external site after logout. Because the URL originates from a trusted hf.space domain, users are more likely to trust the link.\n\n## Impact\n\nPhishing \u2014 an attacker can use the trusted domain to redirect users to a malicious site. No direct data exposure or server-side impact.\n\n ## Fix\nThe _target_url parameter is now sanitized to only use the path, query, and fragment, stripping any scheme or host.",
  "id": "GHSA-pfjf-5gxr-995x",
  "modified": "2026-06-06T00:22:30Z",
  "published": "2026-03-01T01:29:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gradio-app/gradio/security/advisories/GHSA-pfjf-5gxr-995x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28415"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gradio-app/gradio/commit/dfee0da06d0aa94b3c2684131e7898d5d5c1911e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gradio-app/gradio"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gradio-app/gradio/releases/tag/gradio%406.6.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/gradio/PYSEC-2026-65.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Gradio has an Open Redirect in its OAuth Flow"
}



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