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Red Hat disclosed CVE-2026-10059, an Important-severity privilege-escalation flaw in the ClusterCurator controller component of Multicluster Engine for Kubernetes. The vulnerability allows a tenant administrator with only namespace-scoped privileges to create a namespaced ClusterCurator, which causes the controller to create a cluster-installer ServiceAccount in the tenant namespace and bind it to cluster-wide curator privileges. Red Hat scored the issue CVSS 9.1 and mapped it to CWE-266 for incorrect privilege assignment.
Because the privileged ServiceAccount is created inside a tenant-controlled namespace, an attacker with namespace admin rights can mint a token for it and immediately inherit cluster-wide authority, effectively gaining full control of the Kubernetes cluster. Red Hat said the affected component is multicluster-engine/cluster-curator-controller-rhel9, reported that no mitigation meeting its product security criteria is currently available, and credited Christopher Lusk of North Echo Security Research with reporting the bug.
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The CVE record indicates that CVE-2026-10059 was newly received by secalert@redhat.com. The entry identifies the flaw as a CWE-266 privilege-assignment issue that can lead to full cluster control.
Red Hat published CVE-2026-10059 as an Important severity vulnerability affecting multicluster-engine/cluster-curator-controller-rhel9 in Multicluster Engine for Kubernetes. The advisory states that a tenant administrator with namespace-scoped privileges can escalate to cluster-wide administrative authority and that no mitigation meeting Red Hat's product security criteria is currently available.
Red Hat created Bugzilla entry 2483187 documenting a privilege-escalation issue in the Multicluster Engine for Kubernetes ClusterCurator controller. The report describes how a namespace-scoped tenant admin can mint a token for a controller-created ServiceAccount and gain cluster-wide curator authority.
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Red Hat disclosed **CVE-2026-73268**, an Important-severity flaw in the `cluster-curator-controller` component of **Multicluster Engine for Kubernetes** that can let a tenant escalate privileges to the controller’s level. The issue stems from the `CreateJob()` function improperly unmarshaling user-controlled data from `spec.install.overrideJob` into a Kubernetes `Job` without validating dangerous fields, enabling arbitrary Job specification injection by users who can create or update `ClusterCurator` resources. Successful exploitation can cause the injected Job to run under the controller’s privileged ServiceAccount, potentially allowing arbitrary code execution, access to cluster-wide secrets, and control over managed cluster resources. Red Hat scored the bug **9.9 CVSS v3.1** and linked it to **CWE-94**; affected software includes `multicluster-engine/cluster-curator-controller-rhel9`. Recommended mitigations include applying vendor fixes, tightening **RBAC** so only trusted administrators can manage `clustercurators.cluster.open-cluster-management.io`, and reviewing controller privileges and validation controls around Job creation.
Aug 13, 2026
Red Hat disclosed **`CVE-2026-73269`**, a critical privilege-escalation flaw in the `cluster-curator-controller` component used by **OpenShift Multicluster Engine for Kubernetes**. The bug allows a tenant with only namespace-level access to create a crafted `ClusterCurator` resource whose `metadata.name` differs from `metadata.namespace`, triggering the controller to create a cluster-scoped `ClusterRoleBinding` and, in some cases, a `RoleBinding` in an arbitrary namespace. Those bindings can attach the tenant’s namespace-local `cluster-installer` service account to the powerful curator role, effectively breaking namespace isolation. Successful exploitation can elevate a local tenant to **cluster-wide privileges**, including access to and manipulation of secrets, management of cluster actions, and deletion of hosted clusters or node pools. The issue carries a **CVSS 3.1 score of 9.9** and affects `multicluster-engine/cluster-curator-controller-rhel9`. Red Hat advised organizations to apply vendor fixes and reduce exposure by restricting creation of `ClusterCurator` resources through RBAC, enforcing matching `metadata.name` and `metadata.namespace` with an admission controller, and reviewing permissions that allow creation of cluster-scoped resources.
Aug 13, 2026
Red Hat Advanced Cluster Management for Kubernetes 2 is affected by **CVE-2026-10090**, an Important privilege escalation flaw in the `multicluster-operators-subscription` component that can let a user with namespace-scoped `edit` rights gain full `cluster-admin` access. Red Hat assigned the issue a **CVSS v3.1 score of 9.9**, and the Canadian Centre for Cyber Security issued advisory **AV26-803** urging organizations to review Red Hat guidance and apply updates when available. According to Red Hat's bug report and CVE record, the Application Subscription controller can be abused by creating a malicious Channel and Subscription that point to an attacker-controlled Helm repository. The controller then applies the Helm chart with elevated privileges without verifying the creator holds the required `open-cluster-management:subscription-admin` role and without restricting deployed resources to the subscription namespace, allowing deployment of cluster-scoped objects such as a `ClusterRoleBinding` that grants the attacker's ServiceAccount the `cluster-admin` ClusterRole. Red Hat said no mitigation meeting its product security criteria is currently available, and credited Christopher Lusk of North Echo Security Research with reporting the flaw.
Aug 14, 2026