What is CVE-2026-78609?

CVE-2026-78609 is a medium-severity vulnerability in Elastic Eck Operator, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-09-02.

How severe is CVE-2026-78609?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Elastic Eck Operator

CVE-2026-78609

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.

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

Affected products

Elastic Eck Operator

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security@elastic.co

Frequently asked questions

What is CVE-2026-78609?: CVE-2026-78609 is a medium-severity vulnerability in Elastic Eck Operator, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-09-02.
How severe is CVE-2026-78609?: Medium severity. CVSS v3 base score is 5.4 out of 10.