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Vulnerability · Published Aug 17, 2026 · Assigned by redhat

CVE-2026-66792Multicloud-operators-subscription: multicloud-operators-subscription: isclusteradmin() trusts user-settable annotations on managed clusters

Critical 9.9

In plain English

A critical-severity incorrect authorization in Multicluster Global Hub 1.4.9 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).

Severity (CVSS 3.1)9.9Critical
Exploit odds (30 days)0.7%top 47.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in the multicloud-operators-subscription component. This vulnerability allows a user on a managed cluster to escalate their privileges by creating a Subscription with specific, crafted annotations. Successful exploitation grants the attacker the ability to deploy resources into any namespace with the elevated permissions of the controller's Service Account, potentially leading to unauthorized access and control over cluster resources.

Affected products (as reported)

VendorProductVersions
Red Hat Multicluster Global Hub 1.4.9 see references
Red Hat Multicluster Global Hub 1.4.9 see references
Red Hat Multicluster Global Hub 1.4.9 see references
Red Hat Multicluster Global Hub 1.5.8 see references
Red Hat Multicluster Global Hub 1.5.8 see references
Red Hat Multicluster Global Hub 1.5.8 see references
Red Hat Multicluster Global Hub 1.6.6 see references
Red Hat Multicluster Global Hub 1.6.6 see references
Red Hat Multicluster Global Hub 1.6.6 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References