{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-78581", "assignerOrgId": "271b6943-45a9-4f3a-ab4e-976f3fa05b5a", "state": "PUBLISHED", "assignerShortName": "elastic", "dateReserved": "2026-08-24T21:13:45.971Z", "datePublished": "2026-08-25T13:08:11.520Z", "dateUpdated": "2026-08-25T13:08:11.520Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Kibana", "vendor": "Elastic", "versions": [{"lessThanOrEqual": "8.16.2", "status": "affected", "version": "8.0.0", "versionType": "semver"}]}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana can lead to unauthorized data modification via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). Under certain conditions, an authenticated user could reference another user's AI Assistant conversation identifier to access or modify a conversation they do not own. Successful exploitation requires knowledge of a hard-to-guess identifier.</p>"}], "value": "Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana can lead to unauthorized data modification via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). Under certain conditions, an authenticated user could reference another user's AI Assistant conversation identifier to access or modify a conversation they do not own. Successful exploitation requires knowledge of a hard-to-guess identifier."}], "impacts": [{"capecId": "CAPEC-1", "descriptions": [{"lang": "en", "value": "CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseSeverity": "MEDIUM", "baseScore": 4.2, "confidentialityImpact": "LOW", "integrityImpact": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "privilegesRequired": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "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": "2026-08-25T13:08:11.520Z"}, "references": [{"url": "https://discuss.elastic.co/t/kibana-8-16-3-8-17-2-security-update-esa-2026-51/387446"}], "source": {"discovery": "Elastic"}, "title": "Authorization Bypass Through User-Controlled Key in Kibana Leading to Unauthorized Data Modification in Kibana", "x_generator": {"engine": "Elastic CVE Publisher 0.0.1"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Kibana", "vendor": "Elastic", "versions": [{"lessThanOrEqual": "8.16.2", "status": "affected", "version": "8.0.0", "versionType": "semver"}]}], "source": "security@elastic.co"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana can lead to unauthorized data modification via Accessing Functionality Not Properly Constrained by ACLs (CAPEC-1). Under certain conditions, an authenticated user could reference another user's AI Assistant conversation identifier to access or modify a conversation they do not own. Successful exploitation requires knowledge of a hard-to-guess identifier."}], "id": "CVE-2026-78581", "lastModified": "2026-08-25T13:19:31.120", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 2.5, "source": "security@elastic.co", "type": "Secondary"}]}, "published": "2026-08-25T13:19:31.120", "references": [{"source": "security@elastic.co", "url": "https://discuss.elastic.co/t/kibana-8-16-3-8-17-2-security-update-esa-2026-51/387446"}], "sourceIdentifier": "security@elastic.co", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-639"}], "source": "security@elastic.co", "type": "Secondary"}]}

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