How severe is CVE-2026-78600?

CVE-2026-78600 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-78600 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-78600?

CVE-2026-78600 affects Elastic Elastic Cloud On Kubernetes. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-78600?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-78600 published?

CVE-2026-78600 was published on 2026-09-02 and last updated on 2026-09-03.

CVE-2026-78600

CVE-2026-78600 is a low-severity vulnerability in Elastic Elastic Cloud On Kubernetes with a CVSS 3.x base score of 3.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-459.

Key facts

Severity: Low (CVSS 3.x base score 3.5)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-459
Affected product: Elastic Elastic Cloud On Kubernetes
Published: 2026-09-02
Last modified: 2026-09-03

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.

Frequently asked questions

What is CVE-2026-78600?: 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.
How severe is CVE-2026-78600?: CVE-2026-78600 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-78600 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-78600?: CVE-2026-78600 affects Elastic Elastic Cloud On Kubernetes. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-78600?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-78600 published?: CVE-2026-78600 was published on 2026-09-02 and last updated on 2026-09-03.

References

https://discuss.elastic.co/t/elastic-cloud-on-kubernetes-3-5-0-security-update-esa-2026-146/390106

Affected products (1)

cpe:2.3:a:elastic:elastic_cloud_on_kubernetes:*:*:*:*:*:*:*:*

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