CVE-2026-110744 in Multicluster Global Hub
Summary
by MITRE • 10/22/2026
A flaw was found in multicluster-global-hub-operator-bundle. The operator is configured with overly broad role-based access control (RBAC) permissions that grant cluster-wide impersonation of arbitrary users, groups, and service accounts without restriction. An attacker who compromises the operator or obtains its service account credentials can exploit this flaw to achieve privilege escalation, gaining full administrative control over the cluster.
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Analysis
by VulDB Data Team • 10/22/2026
The vulnerability identified in multicluster-global-hub-operator-bundle represents a critical misconfiguration of role-based access control mechanisms within Kubernetes environments. The core technical flaw lies in the overly permissive nature of the RBAC policies assigned to the operator's service account. Specifically, these permissions grant cluster-wide impersonation capabilities that allow the holder of the credentials to act as any arbitrary user, group, or service account without restriction. This level of access effectively bypasses standard identity verification and authorization checks, creating a direct path for privilege escalation from a compromised component to full administrative control over the entire cluster.
From an operational perspective, this flaw poses a severe risk to multi-cluster management architectures where such operators are commonly deployed. If an attacker compromises the multicluster-global-hub-operator-bundle or steals its associated service account credentials, they can exploit these impersonation rights to assume the identity of highly privileged accounts, including cluster-admins. This allows the attacker to execute any command within the cluster, access sensitive data stored in secrets and configmaps, modify deployment configurations, and potentially pivot to other connected clusters managed by the same hub operator. The impact is not limited to a single namespace but extends across all resources visible to the operator, effectively granting root-level control over the infrastructure.
This vulnerability aligns closely with CWE-269, which describes Improper Privilege Management, specifically regarding the assignment of excessive privileges that are unnecessary for the component's function. Furthermore, it maps directly to MITRE ATT&CK technique T1078, Valid Accounts, and more specifically T1078.004, Cloud Account Impersonation. The ability to impersonate arbitrary users is a classic indicator of lateral movement within cloud-native environments, allowing attackers to maintain persistence and expand their foothold across the enterprise network by leveraging trusted identities that are already authorized for high-level operations.
Mitigation strategies must focus on applying the principle of least privilege immediately. Administrators should audit the RBAC bindings associated with the multicluster-global-hub-operator-bundle service account and remove any cluster-scoped impersonation permissions unless absolutely required for specific, well-defined operational tasks. Where possible, access should be restricted to namespace-level scopes rather than cluster-wide grants. Additionally, implementing strict network policies to limit communication between components can reduce the attack surface if a component is compromised. Regular rotation of service account tokens and monitoring for anomalous authentication patterns associated with impersonation activities are also recommended defensive measures to detect potential exploitation attempts early in the kill chain.