{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-103009", "assignerOrgId": "271b6943-45a9-4f3a-ab4e-976f3fa05b5a", "state": "PUBLISHED", "assignerShortName": "elastic", "dateReserved": "2026-09-29T20:57:38.467Z", "datePublished": "2026-10-06T19:31:53.261Z", "dateUpdated": "2026-10-06T19:52:13.370Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Elasticsearch", "vendor": "Elastic", "versions": [{"status": "affected", "versionType": "semver", "version": "8.13.0", "lessThanOrEqual": "8.19.22"}, {"status": "affected", "versionType": "semver", "version": "9.0.0", "lessThanOrEqual": "9.4.7"}, {"status": "affected", "versionType": "semver", "version": "9.5.0", "lessThanOrEqual": "9.5.4"}]}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>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.</p>"}]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-639", "description": "CWE-639 Authorization Bypass Through User-Controlled Key", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "271b6943-45a9-4f3a-ab4e-976f3fa05b5a", "shortName": "elastic", "dateUpdated": "2026-10-06T19:31:53.261Z"}, "references": [{"url": "https://discuss.elastic.co/t/elasticsearch-8-19-23-9-4-8-9-5-5-security-update-esa-2026-199/390874"}], "source": {"discovery": "Elastic"}, "title": "Authorization Bypass Through User-Controlled Key in Elasticsearch Leading to Information Disclosure", "x_generator": {"engine": "Elastic CVE Publisher 1.0.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-06T19:52:05.345727Z", "id": "CVE-2026-103009", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-06T19:52:13.370Z"}}]}}

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