GHSA-HM8F-75XX-W2VR

Vulnerability from github – Published: 2026-01-26 21:34 – Updated: 2026-01-26 21:34
VLAI?
Summary
sigstore CSRF possibility in OIDC authentication during signing
Details

Summary

The sigstore-python OAuth authentication flow is susceptible to Cross-Site Request Forgery.

Details

_OAuthSession creates a unique "state" and sends it as a parameter in the authentication request but the "state" in the server response seems not not be cross-checked with this value.

Fix should be fairly trivial.

Impact

This should be low impact: A man-in-the middle attacker could trick a sigstore-python user into signing something with an identity controlled by the attacker (by returning the response to an authentication request they created). This would be quite confusing but not dangerous.

Severity ?
0.0 (None)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "sigstore"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-24408"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-352"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-26T21:34:50Z",
    "nvd_published_at": null,
    "severity": "LOW"
  },
  "details": "### Summary\n\nThe sigstore-python OAuth authentication flow is susceptible to Cross-Site Request Forgery.\n\n### Details\n\n`_OAuthSession` creates a unique \"state\" and sends it as a parameter in the authentication request but the \"state\" in the server response seems not not be cross-checked with this value. \n\nFix should be fairly trivial.\n\n### Impact\n\nThis should be low impact: A man-in-the middle attacker could trick a sigstore-python user into signing something with an identity controlled by the attacker (by returning the response to an authentication request they created). This would be quite confusing but not dangerous.",
  "id": "GHSA-hm8f-75xx-w2vr",
  "modified": "2026-01-26T21:34:50Z",
  "published": "2026-01-26T21:34:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sigstore/sigstore-python/security/advisories/GHSA-hm8f-75xx-w2vr"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sigstore/sigstore-python/commit/5e77497fe8f0b202bdd118949074ec2f20da69aa"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sigstore/sigstore-python"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sigstore/sigstore-python/releases/tag/v4.2.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "sigstore CSRF possibility in OIDC authentication during signing"
}


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