CVE-2026-78609CWE-863broken-access-control

CVE-2026-78609

Medium · published September 2, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
3.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00150 · 3.8th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-09-02T19:17Z
Affected products (1)
ProductVersionsFixed in
elastic/elastic_cloud_on_kubernetes≥ 2.6.0, < 3.5.03.5.0
References (1)
https://discuss.elastic.co/t/elastic-cloud-on-kubernetes-3-5-0-security-update-esa-2026-145/390105 · [email protected]
EPSS history
Timeline
  • 04 SEP 03:44Z
    EPSS moved — → 0%
    epss
  • 02 SEP 14:43Z
    Incorrect Authorization in Elastic Cloud on Kubernetes Leading to Unauthorized Modification of Data
    cvelistv5