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HIGH

CVE-2026-73267

CVSS v3

7.7

HIGH

EPSS Score

0.6 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-73267 Red Hat Product Security24 products fixed

    clusterclaims-controller: ManagedCluster deletion keyed solely on ClusterClaim.Spec.Namespace with no local ownership check

  • RHSA-2026:59593 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: multicluster engine for Kubernetes v2.17.2 security update

  • RHSA-2026:59579 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: multicluster engine for Kubernetes v2.6.14 security update

  • RHSA-2026:59559 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: multicluster engine for Kubernetes v2.9.7 security update

  • RHSA-2026:59558 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: multicluster engine for Kubernetes v2.8.10 security update

  • RHSA-2026:59557 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: multicluster engine for Kubernetes v2.10.6 security update

1 more advisory

Full record on NVD

Description

A flaw was found in the clusterclaims-controller component of multicluster engine (MCE). A tenant with standard permissions to create and delete ClusterClaim resources can exploit this by manipulating the `spec.namespace` field. This allows the tenant to specify and delete any ManagedCluster, including the hub's local-cluster or other tenants' clusters, due to a missing ownership check. This vulnerability can lead to a denial of service by enabling unauthorized deletion of ManagedClusters.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Published
2026-08-21
Last Modified
2026-08-21

Frequently asked questions

What is CVE-2026-73267?

A flaw was found in the clusterclaims-controller component of multicluster engine (MCE). A tenant with standard permissions to create and delete ClusterClaim resources can exploit this by manipulating the `spec.namespace` field. This allows the tenant to specify and delete any ManagedCluster, including the hub's local-cluster or other tenants' clusters, due to a missing ownership check. This vulnerability can lead to a denial of service by enabling unauthorized deletion of ManagedClusters.

Is CVE-2026-73267 actively exploited?

Active exploitation of CVE-2026-73267 has not been confirmed. Its EPSS score was 0.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-73267?

CVE-2026-73267 has a CVSS v3 base score of 7.7 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.

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