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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
Description
A vulnerability in the assisted-service REST API, an optional Assisted Installer (assisted-service) component in the Multicluster Engine (MCE), allows an authenticated user with minimal namespace-scoped privileges to obtain administrative credentials for arbitrary clusters provisioned through the hub.
The credentials download endpoint (GET /v2/clusters/{cluster_id}/credentials, which returns the kubeadmin password) and the kubeconfig download endpoint are operational in AUTH_TYPE=local mode, the only authentication mode available in on-premises ACM/MCE hub deployments. The local authenticator unconditionally grants full administrative access to any request bearing a valid JWT, with no per-endpoint restrictions. A valid local JWT is embedded as a plaintext query parameter in InfraEnvStatus.ISODownloadURL and is readable by any user who has get rights on an InfraEnv object in their own namespace.
The affected components ship as part of Multicluster Engine (MCE). The Red Hat Advanced Cluster Management (ACM) deployments that include MCE are equally affected.
This issue does not affect the hosted SaaS offering (console.redhat.com), which uses a different authentication mode.
Successful exploitation gives the attacker the kubeadmin password and kubeconfig for any OpenShift cluster provisioned through the affected hub, granting unrestricted root-level administrative access to those spoke clusters.
Metrics
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CVE Modified by Red Hat, Inc.5/19/2026 5:16:20 AM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:18584
Added
Reference
https://access.redhat.com/errata/RHSA-2026:18585
Initial Analysis by NIST5/04/2026 10:57:57 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Added
CPE Configuration
OR
*cpe:2.3:a:redhat:multicluster_engine_for_kubernetes:2.1:*:*:*:*:*:*:*
*cpe:2.3:a:redhat:multicluster_engine_for_kubernetes:2.7:*:*:*:*:*:*:*
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:11511 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:11512 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:12116 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:12337 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-7163 Types: Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2463152 Types: Issue Tracking
CVE Modified by Red Hat, Inc.5/04/2026 6:16:19 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:12337
CVE Modified by Red Hat, Inc.5/04/2026 2:16:01 AM
Action
Type
Old Value
New Value
Removed
Reference
https://access.redhat.com/errata/RHSA-2026:12337
CVE Modified by Red Hat, Inc.4/30/2026 6:16:26 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:11511
Added
Reference
https://access.redhat.com/errata/RHSA-2026:11512
CVE Modified by Red Hat, Inc.4/30/2026 2:16:31 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:12116
CVE Modified by Red Hat, Inc.4/30/2026 12:16:45 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:12337
New CVE Received from Red Hat, Inc.4/30/2026 10:16:36 AM
Action
Type
Old Value
New Value
Added
Description
A vulnerability in the assisted-service REST API, an optional Assisted Installer (assisted-service) component in the Multicluster Engine (MCE), allows an authenticated user with minimal namespace-scoped privileges to obtain administrative credentials for arbitrary clusters provisioned through the hub.
The credentials download endpoint (GET /v2/clusters/{cluster_id}/credentials, which returns the kubeadmin password) and the kubeconfig download endpoint are operational in AUTH_TYPE=local mode, the only authentication mode available in on-premises ACM/MCE hub deployments. The local authenticator unconditionally grants full administrative access to any request bearing a valid JWT, with no per-endpoint restrictions. A valid local JWT is embedded as a plaintext query parameter in InfraEnvStatus.ISODownloadURL and is readable by any user who has get rights on an InfraEnv object in their own namespace.
The affected components ship as part of Multicluster Engine (MCE). The Red Hat Advanced Cluster Management (ACM) deployments that include MCE are equally affected.
This issue does not affect the hosted SaaS offering (console.redhat.com), which uses a different authentication mode.
Successful exploitation gives the attacker the kubeadmin password and kubeconfig for any OpenShift cluster provisioned through the affected hub, granting unrestricted root-level administrative access to those spoke clusters.
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