CVE-2026-102406

Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana could lead to cross-tenant data interception. In this context, "tenant" refers to a user or team sharing the same Kibana deployment, not a separate Elastic Cloud organization or customer. Kibana's Fleet package installation process allowed a user holding delegated Fleet package-management privileges, without direct Elasticsearch administrative privileges, to claim a data stream identifier already in use by another tenant. Because ownership of that identifier was not verified before Fleet applied the uploaded package's generated index and ingest-pipeline settings to already-existing infrastructure, an attacker could redirect an existing tenant's data stream through infrastructure under their control. This exposed the affected tenant's subsequently ingested data to unauthorized disclosure and modification, and prevented that data from reaching its intended destination. Interception could continue even after the malicious package was removed, requiring separate remediation of the affected infrastructure.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://discuss.elastic.co/t/kibana-8-19-22-9-4-7-9-5-4-security-update-esa-2026-187/390860	Vendor Advisory Mitigation

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:elastic:kibana::::::::
	cpe:2.3:a:elastic:kibana::::::::
	cpe:2.3:a:elastic:kibana::::::::

History

13 Oct 2026, 18:50

Type	Values Removed	Values Added
CPE		cpe:2.3:a:elastic:kibana::::::::
References	~~() https://discuss.elastic.co/t/kibana-8-19-22-9-4-7-9-5-4-security-update-esa-2026-187/390860 -~~	() https://discuss.elastic.co/t/kibana-8-19-22-9-4-7-9-5-4-security-update-esa-2026-187/390860 - Vendor Advisory, Mitigation
First Time		Elastic kibana Elastic

06 Oct 2026, 20:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-06 20:17

Updated : 2026-10-13 18:50

NVD link : CVE-2026-102406

Mitre link : CVE-2026-102406

CVE.ORG link : CVE-2026-102406

JSON object : View

Products Affected

elastic

kibana

CWE

CWE-639

Authorization Bypass Through User-Controlled Key

{"id": "CVE-2026-102406", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-102406", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-07T00:00:00+00:00"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security@elastic.co", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security@elastic.co", "affectedData": [{"vendor": "Elastic", "product": "Kibana", "versions": [{"status": "affected", "version": "8.14.0", "versionType": "semver", "lessThanOrEqual": "8.19.21"}, {"status": "affected", "version": "9.0.0", "versionType": "semver", "lessThanOrEqual": "9.4.6"}, {"status": "affected", "version": "9.5.0", "versionType": "semver", "lessThanOrEqual": "9.5.3"}], "defaultStatus": "unaffected"}]}], "published": "2026-10-06T20:17:12.480", "references": [{"url": "https://discuss.elastic.co/t/kibana-8-19-22-9-4-7-9-5-4-security-update-esa-2026-187/390860", "tags": ["Vendor Advisory", "Mitigation"], "source": "security@elastic.co"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security@elastic.co", "description": [{"lang": "en", "value": "CWE-639"}]}], "descriptions": [{"lang": "en", "value": "Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana could lead to cross-tenant data interception. In this context, \"tenant\" refers to a user or team sharing the same Kibana deployment, not a separate Elastic Cloud organization or customer. Kibana's Fleet package installation process allowed a user holding delegated Fleet package-management privileges, without direct Elasticsearch administrative privileges, to claim a data stream identifier already in use by another tenant. Because ownership of that identifier was not verified before Fleet applied the uploaded package's generated index and ingest-pipeline settings to already-existing infrastructure, an attacker could redirect an existing tenant's data stream through infrastructure under their control. This exposed the affected tenant's subsequently ingested data to unauthorized disclosure and modification, and prevented that data from reaching its intended destination. Interception could continue even after the malicious package was removed, requiring separate remediation of the affected infrastructure."}], "lastModified": "2026-10-13T18:50:03.820", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2D4E9E70-3390-4E24-86DE-8877F34A03C2", "versionEndExcluding": "8.19.22", "versionStartIncluding": "8.14.0"}, {"criteria": "cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "51B034B7-56C9-4DBE-87EC-7B4268C1B426", "versionEndExcluding": "9.4.7", "versionStartIncluding": "9.0.0"}, {"criteria": "cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6309CE44-86CE-4431-9060-25FF2D4E511F", "versionEndExcluding": "9.5.4", "versionStartIncluding": "9.5.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@elastic.co"}