CVE-2026-78600 in Eck Operator
Summary
by MITRE • 09/02/2026
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.
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Analysis
by VulDB Data Team • 09/02/2026
The vulnerability identified as an Incomplete Cleanup issue within Elastic Cloud on Kubernetes represents a critical flaw in the lifecycle management of authentication credentials during role-based access control operations. This specific defect allows for Privilege Abuse, where a low-privileged tenant can retain unauthorized read access to an Elasticsearch cluster even after a cross-namespace association has been explicitly denied by RBAC enforcement mechanisms. The core technical failure lies not in the initial authorization decision but in the subsequent cleanup phase of that decision process. When the system evaluates and rejects a request for cross-namespace resource linkage, it fails to properly revoke or invalidate any previously established authentication tokens or session credentials associated with that attempted association. This creates a state inconsistency where the access control policy correctly denies new connections, yet existing active sessions remain valid due to incomplete teardown procedures.
From an operational perspective, this flaw enables persistent unauthorized access that persists beyond the immediate scope of the denied request. An attacker leveraging this vulnerability can exploit the lingering credentials to maintain read-only access to sensitive data stored within the Elasticsearch cluster. This scenario aligns with CAPEC-122, which describes Privilege Abuse as a technique where an actor exploits legitimate privileges or artifacts created during normal operations to gain unauthorized capabilities. In this context, the artifact is the authentication credential that was issued prior to the denial event and never properly cleaned up by the system. The attacker does not need to bypass RBAC rules directly; instead, they exploit the administrative oversight in resource cleanup to maintain a foothold within the cluster environment.
The impact of this vulnerability extends beyond simple data exfiltration. Because Elasticsearch clusters often serve as central repositories for logs, metrics, and application traces, unauthorized read access can lead to significant information disclosure. Attackers may harvest sensitive operational data, user activity logs, or proprietary business intelligence that was never intended to be accessible across namespace boundaries in Kubernetes environments. This undermines the fundamental isolation guarantees provided by multi-tenant architectures, potentially violating compliance requirements for data segregation such as those found in SOC2 or ISO 27001 standards regarding logical access controls and separation of duties.
Mitigation strategies must focus on ensuring strict adherence to cleanup protocols during RBAC evaluation failures. Developers should implement robust event listeners that trigger immediate credential revocation whenever a cross-namespace association request is denied, ensuring no residual authentication state remains active. Additionally, implementing short-lived token expiration policies can limit the window of opportunity for exploitation even if cleanup fails temporarily. System administrators should also enforce regular audits of active sessions and associated permissions to detect any anomalies indicative of incomplete teardown processes. Upgrading to patched versions of Elastic Cloud on Kubernetes that address this specific CWE-459 flaw is essential, as these updates typically include corrected lifecycle management logic for cross-cluster authentication workflows.