Incorrect Authorization in Elastic Cloud on Kubernetes Leading to Unauthorized Modification of Data
Incorrect Authorization (CWE-863) in Elastic Cloud on Kubernetes (ECK) can lead to unauthorized modification of data via Metadata Spoofing (CAPEC-690). An actor holding limited Kubernetes permissions confined to a single namespace could cause attacker-controlled certificate material to be included in the Elasticsearch client trust bundle managed by ECK in a separate namespace.
Affected Versions:
- All versions from 2.6.0 up to and including 3.4.1
Affected Configurations:
Elastic Cloud on Kubernetes deployments operating in multi-tenant Kubernetes environments where separate tenants are able to create Secrets in namespaces monitored by ECK. The confidentiality and integrity impact is most significant where Elasticsearch client certificate authentication is configured and active.
Solutions and Mitigations:
The issue is resolved in Elastic Cloud on Kubernetes version 3.5.0.
For Users that Cannot Upgrade:
There are no workarounds for this vulnerability.
Indicators of Compromise (IOC)
No specific indicators of compromise have been identified for this vulnerability.
Severity: CVSSv3.1: Medium ( 5.4 ) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVE ID: CVE-2026-78609
Problem Type: CWE-863 - Incorrect Authorization
Impact: CAPEC-690 - Metadata Spoofing