Red Hat Multicluster Engine for Kubernetes HyperShift Operator improper authorization

Summaryinfo

A vulnerability has been found in Red Hat Multicluster Engine for Kubernetes and classified as very critical. This impacts an unknown function of the component HyperShift Operator. The manipulation leads to improper authorization. This vulnerability is referenced as CVE-2026-101919. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Red Hat Multicluster Engine for Kubernetes (the affected version unknown). It has been rated as very critical. This issue affects an unknown part of the component HyperShift Operator. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in the HyperShift operator. The operator copies user-provided Kubernetes configuration (kubeconfig) secrets directly into the privileged control plane namespace without proper validation or sanitization. An authenticated user with cluster and secret creation permissions can exploit this vulnerability by supplying a configuration containing unauthorized executable plugins. When downstream controllers consume this configuration, an attacker can achieve arbitrary code execution within the control plane.

It is possible to read the advisory at access.redhat.com. The identification of this vulnerability is CVE-2026-101919 since 09/28/2026. The exploitation is known to be easy. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/05/2026). The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Virtualization Software

Vendor

• Red Hat

Name

• Multicluster Engine for Kubernetes

License

• open-source

Website

• Vendor: https://www.redhat.com/

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