{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "8.13.0"
              },
              {
                "fixed": "8.19.23"
              },
              {
                "introduced": "9.0.0"
              },
              {
                "fixed": "9.4.8"
              },
              {
                "introduced": "9.5.0"
              },
              {
                "fixed": "9.5.5"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "09df99393193b2c53d92899662a8b8b3c55b45cd"
            },
            {
              "fixed": "6940e499f8a38841809b8e295a20c6421c95d9e4"
            },
            {
              "introduced": "112859b85d50de2a7e63f73c8fc70b99eea24291"
            },
            {
              "fixed": "c042abbb0eaaaa61b49beef21d517468861a4db2"
            },
            {
              "introduced": "8d4246a64bc255212407b1b313fe402391299c88"
            },
            {
              "fixed": "48acba663b09e70b115dd879329141506c377890"
            }
          ],
          "repo": "https://github.com/elastic/elasticsearch",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "elastic",
    "cwe_ids": [
      "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103009.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "8.13.0"
          },
          {
            "last_affected": "8.19.22"
          },
          {
            "introduced": "9.0.0"
          },
          {
            "last_affected": "9.4.7"
          },
          {
            "introduced": "9.5.0"
          },
          {
            "last_affected": "9.5.4"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Authorization Bypass Through User-Controlled Key (CWE-639) in Elasticsearch can lead to Information Disclosure via a specially crafted cross-cluster search request that references an unauthorized shard identifier. Elasticsearch contains an authorization bypass weakness in its handling of cross-cluster search requests made through the Remote Cluster Security (RCS) 2.0 model. An authorization check validates a request against one identifying attribute of the target shard, while a separate, independently-supplied identifying attribute in the same request determines which shard is actually accessed. A holder of a cross-cluster API key authorized for one index can craft a request whose two identifying attributes refer to different indices, causing the request to be authorized against an index they can access while actually operating against a different, unauthorized index. This can expose that index's document contents, field mappings, and other metadata, and in limited cases allows modification of retention-lease state on the unauthorized index.",
  "id": "CVE-2026-103009",
  "modified": "2026-10-11T02:30:48.832875146Z",
  "published": "2026-10-06T19:31:53.261Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://discuss.elastic.co/t/elasticsearch-8-19-23-9-4-8-9-5-5-security-update-esa-2026-199/390874"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103009.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103009"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Authorization Bypass Through User-Controlled Key in Elasticsearch Leading to Information Disclosure"
}