Missing Authorization in Kibana Leading to Unauthorized Disclosure of Fleet Deployment Metadata

{
  "id": "6813d2529324988875368d2f8483fab220a31553836c709e98d1b10fbc1bea1e",
  "url": "https://osv.dev/vulnerability/CVE-2026-78603",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Missing Authorization in Kibana Leading to Unauthorized Disclosure of Fleet Deployment Metadata",
    "summary": "Missing Authorization (CWE-862) in Kibana can lead to information disclosure via Exploiting Incorrectly Configured Access Control Security Levels (CAPEC-180). An authenticated user holding minimal Elasticsearch privileges could bypass Kibana feature authorization and space access controls, resulting in the unauthorized disclosure of Fleet deployment metadata from the default Kibana space.",
    "evidence": "osv:CVE-2026-78603",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-78603",
      "aliases": [
        "CVE-2026-78603"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/elastic/elasticsearch",
              "type": "GIT",
              "events": [
                {
                  "introduced": "112859b85d50de2a7e63f73c8fc70b99eea24291"
                },
                {
                  "fixed": "10011cbc74640115d0ffac0cef7c925aec4754f5"
                },
                {
                  "introduced": "8d4246a64bc255212407b1b313fe402391299c88"
                },
                {
                  "last_affected": "8d4246a64bc255212407b1b313fe402391299c88"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "9.0.0"
                      },
                      {
                        "fixed": "9.4.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:elastic:kibana:9.5.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "9.5.0"
                      },
                      {
                        "last_affected": "9.5.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "9.5.0",
            "v9.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-78603.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/elastic/kibana",
              "type": "GIT",
              "events": [
                {
                  "introduced": "504d6bfa94cca17fabb76e06152c30c4f0c3efdd"
                },
                {
                  "fixed": "692551ad493ed71169e295e2160446428ee00b15"
                },
                {
                  "introduced": "240f7d17d21408117f4295bcf74d48092ab0d078"
                },
                {
                  "last_affected": "240f7d17d21408117f4295bcf74d48092ab0d078"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "9.0.0"
                      },
                      {
                        "fixed": "9.4.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:elastic:kibana:9.5.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "9.5.0"
                      },
                      {
                        "last_affected": "9.5.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "9.5.0",
            "v9.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-78603.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.332114911Z",
      "provider": "osv",
      "references": [
        "https://discuss.elastic.co/t/kibana-9-4-6-9-5-1-security-update-esa-2026-149/390069",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78603.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-78603"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "elastic",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.5.0"
                  },
                  {
                    "last_affected": "9.5.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandaloneSingleVersion"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0.0"
                  },
                  {
                    "last_affected": "9.4.5"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78603.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-78603",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505837,
  "published_at": "2026-09-01T19:20:35.832+00:00"
}