sigstore has CSRF possibility in OIDC authentication during signing

{
  "id": "29db3324a18656fe3df4ee5e48e3f5b534b1634ed72166e43aa0dcf5363ac111",
  "url": "https://osv.dev/vulnerability/CVE-2026-24408",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "sigstore has CSRF possibility in OIDC authentication during signing",
    "summary": "sigstore-python is a Python tool for generating and verifying Sigstore signatures. Prior to version 4.2.0, the sigstore-python OAuth authentication flow is susceptible to Cross-Site Request Forgery. `_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. Version 4.2.0 contains a patch for the issue.",
    "evidence": "osv:CVE-2026-24408",
    "products": [],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-24408",
      "aliases": [
        "CVE-2026-24408",
        "GHSA-hm8f-75xx-w2vr",
        "PYSEC-2026-1924"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/sigstore/sigstore-python",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "94818e43224db2aed78f3cf066a561cf95982051"
                },
                {
                  "fixed": "5e77497fe8f0b202bdd118949074ec2f20da69aa"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:sigstore-python:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.2.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5e77497fe8f0b202bdd118949074ec2f20da69aa"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "94818e43224db2aed78f3cf066a561cf95982051"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v4.2.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.1.0",
            "v4.0.0",
            "v3.6.2",
            "v3.6.1",
            "v3.6.0",
            "v3.5.1",
            "v3.5.0",
            "v3.4.0",
            "v3.3.0",
            "v3.2.0",
            "v3.1.0",
            "v3.0.0",
            "v3.0.0rc2",
            "v3.0.0rc1",
            "v2.1.0",
            "v2.0.1",
            "v2.0.0",
            "v2.0.0rc3",
            "v2.0.0rc2",
            "v2.0.0rc1",
            "v1.1.2",
            "v1.1.2rc1",
            "v1.1.1",
            "v1.1.1rc1",
            "v1.1.0",
            "v1.0.0",
            "v1.0.0rc1",
            "v0.10.0",
            "v0.9.0",
            "v0.8.3",
            "v0.8.2",
            "v0.8.1",
            "v0.8.0",
            "v0.7.0",
            "v0.6.8",
            "v0.6.7",
            "v0.6.6",
            "v0.6.5",
            "v0.6.4",
            "v0.6.3",
            "v0.6.2",
            "v0.6.1",
            "v0.6.0",
            "v0.5.1",
            "v0.5.0",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0",
            "v0.3.1",
            "v0.3.0",
            "v0.2.0",
            "v0.1.0",
            "v0.0.1-pre.3",
            "v0.0.1-pre.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-24408.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.943773295Z",
      "provider": "osv",
      "references": [
        "https://github.com/sigstore/sigstore-python/releases/tag/v4.2.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/24xxx/CVE-2026-24408.json",
        "https://github.com/sigstore/sigstore-python/security/advisories/GHSA-hm8f-75xx-w2vr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-24408",
        "https://github.com/sigstore/sigstore-python/commit/5e77497fe8f0b202bdd118949074ec2f20da69aa"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-352"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/24xxx/CVE-2026-24408.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-24408",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 497979,
  "published_at": "2026-01-26T22:21:35.047+00:00"
}