Low severity · published Sep 2, 2026
CVE-2026-78600
Incomplete Cleanup in Elastic Cloud on Kubernetes Leading to Unauthorized Cross-Namespace Credential Retention
3.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 21% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EO
Eck Operator · Elastic
2.6.0 through 3.4.1 · source: vendor
EC
Elastic Cloud ON Kubernetes · Elastic
2.6.0 before 3.5.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-78600
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-78600
Vendor Advisory
https://discuss.elastic.co/t/elastic-cloud-on-kubernetes-3-5-0-security-update-esa-2026-146/390106
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