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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.
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The Canadian Centre for Cyber Security issued advisory AV26-803 warning that Red Hat Advanced Cluster Management for Kubernetes 2 is affected by CVE-2026-10090. The notice directed users and administrators to review Red Hat guidance and apply security updates when available.
Red Hat published CVE-2026-10090 as an Important privilege escalation vulnerability affecting Red Hat Advanced Cluster Management for Kubernetes 2 and the rhacm2/multicluster-operators-subscription-rhel9 component. Red Hat assigned a CVSS 9.9 score, said no qualifying mitigation was available, and credited Christopher Lusk of North Echo Security Research for reporting the issue.
Red Hat recorded Bugzilla issue 2483292 for a privilege escalation flaw in the Application Subscription controller of Red Hat Advanced Cluster Management for Kubernetes, specifically multicluster-operators-subscription. The issue describes how a namespace-scoped edit user could deploy a cluster-scoped ClusterRoleBinding via a malicious Channel and Subscription to gain cluster-admin privileges.
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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.
Aug 5, 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 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