CVE-2026-78600 Incomplete Cleanup in Elastic Cloud on Kubernetes Leading to Unauthorized Cross-Namespace Credential Retention

Low 3.5 Published 2 Sep 2026 Updated 2 Sep 2026

Incomplete cleanup allows low-privileged tenants to retain unauthorized read access to Elasticsearch clusters after cross-namespace associations are denied.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-78600?

CVE-2026-78600 is a low-severity missing authorization vulnerability in Elastic Eck Operator, published on 2 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Incomplete Cleanup (CWE-459) in Elastic Cloud on Kubernetes (ECK) can lead to unauthorized access via Privilege Abuse (CAPEC-122). Authentication credentials persist after a cross-namespace association has been denied by RBAC enforcement, allowing a low-privileged tenant to retain unauthorized read access to the associated Elasticsearch cluster.

Weakness: CWE-459

Which versions are affected by CVE-2026-78600?

It affects 1 product.

Products include Elastic Elastic Cloud on Kubernetes.

How do I fix CVE-2026-78600?

No fix has been published for CVE-2026-78600 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-78600 being exploited?

There is no known exploitation of CVE-2026-78600 in the wild and no public exploit code.

Sources

Also known as GHSA-pr5w-c42r-pmjr.