# CVE-2026-102406 — Elastic Kibana

> As of 2026-10-08, CVE-2026-102406 is a HIGH-severity vulnerability in Elastic Kibana, CVSS v3.1 8.8, EPSS 0.3% (27.1th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-102406, most recently “Elastic Patches 14 Security Flaws Including Kibana Cross-Tenant Data Interception (CVE-2026-102406)”.

**Last updated:** 2026-10-08

## What is 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.

The record classifies CVE-2026-102406 under weakness class [CWE-639](https://intel.threadlinqs.com/cwe/CWE-639). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 4 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 27.1% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-10-06, last modified 2026-10-08

## Is CVE-2026-102406 being exploited?

It currently carries a trending score of 41 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Elastic](https://intel.threadlinqs.com/vendors/elastic): Kibana

## How to fix CVE-2026-102406

No vendor patch reference has been recorded for CVE-2026-102406 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-102406

1 tracked threat in the Threadlinqs corpus references CVE-2026-102406, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Elastic Patches 14 Security Flaws Including Kibana Cross-Tenant Data Interception (CVE-2026-102406)](https://intel.threadlinqs.com/threat/TL-2026-3268) — HIGH · 2026-10-10

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [discuss.elastic.co](https://discuss.elastic.co/t/kibana-8-19-22-9-4-7-9-5-4-security-update-esa-2026-187/390860)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-102406
Full detection coverage and IOCs for threats exploiting CVE-2026-102406 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp