CVE-2026-70495 in Advanced Cluster Management for Kubernetes
Summary
by MITRE • 08/17/2026
A flaw was found in search-v2-operator. This component's `search-serviceaccount` has overly broad permissions, allowing it to impersonate users and groups across the entire cluster. If an attacker gains access to any of the pods running under this service account, they could exploit this to achieve `system:masters` access, granting them full control over the cluster.
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Analysis
by VulDB Data Team • 09/05/2026
The vulnerability identified in search-v2-operator stems from a critical misconfiguration within its associated Kubernetes ServiceAccount, specifically named search-serviceaccount. This component suffers from overly broad permissions that violate the principle of least privilege, which is fundamental to secure container orchestration environments. The core technical flaw lies in the binding of this service account to cluster-wide roles or role bindings that grant it excessive authority. Rather than being restricted to specific namespaces or limited resource types necessary for its operational function, the search-serviceaccount possesses permissions that allow it to impersonate users and groups across the entire Kubernetes cluster. This configuration error effectively elevates a workload-level compromise into a full administrative takeover of the control plane infrastructure.
From an offensive security perspective, this vulnerability represents a severe escalation path. If an attacker manages to gain initial access to any pod running under the context of the search-serviceaccount through common vectors such as remote code execution vulnerabilities in deployed applications or insecure configuration files, they can immediately leverage the impersonation capabilities granted by the service account's permissions. By exploiting these permissions, the attacker can request tokens for high-privileged identities, including those with system:masters access. This grants them full control over the cluster, allowing them to create new privileged pods, exfiltrate sensitive data from secrets and configmaps, modify network policies to facilitate lateral movement, or even delete critical workloads to cause denial of service. The ability to impersonate arbitrary users means that audit logs may also be manipulated or obscured, complicating forensic analysis and incident response efforts.
This vulnerability maps directly to CWE-250, which describes execution with unnecessary privileges, as the application runs under a context far more powerful than required for its intended function. Furthermore, it aligns with MITRE ATT&CK technique T1498.003, Network Boundary Bridging: Impersonation, where attackers use stolen credentials or tokens to move laterally and escalate privileges within the environment. The specific action of impersonating users falls under T1550.002, Use Alternate Authentication Material: Application Access Token, as the attacker utilizes the service account's ability to generate valid authentication tokens for other identities. This scenario highlights a common pitfall in Kubernetes security where cluster-admin or equivalent broad roles are incorrectly assigned to individual workloads rather than being reserved for human administrators or highly restricted automation pipelines with strict auditing and approval workflows.
To mitigate this risk, immediate remediation is required by reviewing the RBAC (Role-Based Access Control) policies associated with the search-serviceaccount. The service account should be bound only to roles that grant permissions strictly limited to the specific namespaces and resources necessary for its operation. Specifically, any ClusterRoleBinding or RoleBinding that grants impersonation rights such as user.impersonate or group.impersonate must be removed unless absolutely critical, in which case it should be scoped to a single namespace with explicit allow-lists of target users or groups. Additionally, administrators should audit all service accounts across the cluster for similar over-permissioned configurations using automated tools that check against CIS Kubernetes Benchmark guidelines. Implementing admission controllers like OPA Gatekeeper can help enforce policies that prevent future deployments from binding overly permissive roles to workloads. Regular security assessments and continuous monitoring of API server logs for unusual impersonation attempts are also essential to detect any potential exploitation in real-time.