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CVE-2026-102406— Authorization Bypass Through User-Controlled Key in Kibana Leading to Cross-Tenant Data Interception

Quick assessment

Affected
Elastic Kibana
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kibana 中存在基于用户可控键的授权绕过漏洞（CWE-639），可能导致跨租户数据被截获。在此语境中，“租户”指的是共享同一 Kibana 部署实例的用户或团队，而非独立的 Elastic Cloud 组织或客户。 Kibana 的 Fleet 包安装流程允许具备委托的 Fleet 包管理权限、但不直接拥有 Elasticsearch 管理员权限的用户，抢占另一个租户正在使用的数据流标识符（data stream identifier）。在 Fleet 将上传的包所生成的索引（index）和摄取管道（inges

CVSS 8.8 · High

Affected Version Matrix 3

VendorProduct Version RangeStatus
Elastic Kibana 8.14.0≤ 8.19.21 affected
9.0.0≤ 9.4.6 affected
9.5.0≤ 9.5.3 affected
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I. Basic Information for CVE-2026-102406

Vulnerability Information
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Vulnerability Title
Authorization Bypass Through User-Controlled Key in Kibana Leading to Cross-Tenant Data Interception
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Elastic Kibana 8.14.0 ~ 8.19.21 -

II. Public POCs for CVE-2026-102406

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III. Intelligence Information for CVE-2026-102406

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Other References for CVE-2026-102406 (1)

Same Patch Batch · Elastic · 2026-10-06 · 14 CVEs total

CVE-2026-103007 7.2 HIGH Incorrect Authorization in Elasticsearch Leading to Privilege Escalation
CVE-2026-103009 7.1 HIGH Authorization Bypass Through User-Controlled Key in Elasticsearch Leading to Information D
CVE-2026-102412 6.5 MEDIUM Incorrect Authorization in Kibana Leading to Sensitive Information Disclosure
CVE-2026-102409 6.5 MEDIUM Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
CVE-2026-102411 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of
CVE-2026-102404 6.5 MEDIUM Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service
CVE-2026-103008 6.5 MEDIUM Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
CVE-2026-103005 6.5 MEDIUM Memory Allocation with Excessive Size Value in Elasticsearch Leading to Denial of Service
CVE-2026-103006 6.5 MEDIUM Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
CVE-2026-102413 6.2 MEDIUM Uncaught Exception in Elastic Endpoint Leading to Denial of Service
CVE-2026-102407 5.4 MEDIUM Incorrect Authorization in Elasticsearch Leading to Unauthorized Data Stream Modification
CVE-2026-102410 4.3 MEDIUM Missing Authorization in Kibana Leading to Information Disclosure
CVE-2026-102408 4.3 MEDIUM Inefficient Regular Expression Complexity in Elasticsearch Leading to Denial of Service

IV. Related Vulnerabilities

Same product: Kibana
Same vendor: Elastic
Same weakness: CWE-639

V. Comments for CVE-2026-102406

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