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CVE-2026-102406

Authorization Bypass Through User-Controlled Key in Kibana Leading to Cross-Tenant Data Interception

High8.8EPSS 0.35%
Published
Updated
Reserved
Assigned by
elastic

Description

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.

Scores

CVSS scores of CVE-2026-102406, by who scored it
Scored byCVSSScoreVector
elasticCNA (assigner)3.1High8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed3.1High8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.35% · top 72% of all CVEs (4 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.

Weakness

Affected products

  • Elastic · Kibana

    • affected 8.14.0 – ≤ 8.19.21
    • affected 9.0.0 – ≤ 9.4.6
    • affected 9.5.0 – ≤ 9.5.3

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .