{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.3.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "b626ef3d60aaf19c68eeeed5ee81045406c8c6d0"
            },
            {
              "fixed": "a56a5e5a324a1581cbfcdf726dbca3e25b604f86"
            }
          ],
          "repo": "https://github.com/steeltoeoss/steeltoe",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-5mq7-rwhj-4fh9"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-288",
      "CWE-295"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81868.json"
  },
  "details": "Steeltoe is an open source project that provides a collection of libraries that helps users build cloud-native applications. Prior to 4.3.0, Steeltoe.Security.Authorization.Certificate deployments using AddOrgAndSpacePolicies() and UseCertificateAuthorization() trust the public certificate supplied in the X-Client-Cert request header without proving possession of the corresponding private key. Common Cloud Foundry routers do not remove this header from inbound requests. When inbound requests are not restricted to a known trusted proxy source IP, an attacker who obtains the public certificate of an application instance in the target organization or space and can reach the application can spoof X-Client-Cert to bypass the SameOrg and SameSpace policies for the certificate validity period. This issue is fixed in version 4.3.0.",
  "id": "CVE-2026-81868",
  "modified": "2026-09-19T03:30:53.270244685Z",
  "published": "2026-09-17T15:36:23.149Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/SteeltoeOSS/Steeltoe/releases/tag/4.3.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81868.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-5mq7-rwhj-4fh9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81868"
    },
    {
      "type": "FIX",
      "url": "https://github.com/SteeltoeOSS/Steeltoe/commit/b626ef3d60aaf19c68eeeed5ee81045406c8c6d0"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Steeltoe: Header-forwarded client cert lacks proof of private-key possession"
}