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Fencer Vulns
critical 9.9

CVE-2026-66792 json

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

published 2026-08-17 2 mo ago modified 2026-09-29 40 d ago also EUVD-2026-60322

cvss
9.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Multicluster Global Hub 1.4.9 1788355417, 1788355439, 1788355599
  • Red Hat Multicluster Global Hub 1.5.8 1789478830, 1789515288, 1789515408
  • Red Hat Multicluster Global Hub 1.6.6 1790085268, 1790085494, 1790086176
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11 1787262214, 1787263584
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13 1787259284, 1787263693
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14 1786976940, 1787170830
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15 1787238598, 1787240030
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 1787242135, 1787242321
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 1787242108, 1787242131

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-66792 updated cvss 9.9

multicloud-operators-subscription: multicloud-operators-subscription: IsClusterAdmin() trusts user-settable annotations on managed clusters

  • Red Hat OpenShift Container Platform 4 openshift4/cnf-tests-rhel8, openshift4/ztp-site-generate-rhel8
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Multicluster Global Hub 1.4.9 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1788355439, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1788355599, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1788355417
    fixed: vendor fix RHSA-2026:67516
  • Red Hat Multicluster Global Hub 1.5.8 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1789515408, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1789515288, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1789478830
    fixed: vendor fix RHSA-2026:71597
  • Red Hat Multicluster Global Hub 1.6.6 multicluster-globalhub/multicluster-globalhub-agent-rhel9 1790085494, multicluster-globalhub/multicluster-globalhub-manager-rhel9 1790086176, multicluster-globalhub/multicluster-globalhub-rhel9-operator 1790085268
    fixed: vendor fix RHSA-2026:73419
  • Red Hat Advanced Cluster Management for Kubernetes 2.11 rhacm2/multicluster-operators-application-rhel9 1787262214, rhacm2/multicluster-operators-subscription-rhel9 1787263584
    fixed: vendor fix RHSA-2026:60387
  • Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/multicluster-operators-application-rhel9 1787259284, rhacm2/multicluster-operators-subscription-rhel9 1787263693
    fixed: vendor fix RHSA-2026:60390
  • Red Hat Advanced Cluster Management for Kubernetes 2.14 rhacm2/multicluster-operators-application-rhel9 1786976940, rhacm2/multicluster-operators-subscription-rhel9 1787170830
    fixed: vendor fix RHSA-2026:60388
  • Red Hat Advanced Cluster Management for Kubernetes 2.15 rhacm2/multicluster-operators-application-rhel9 1787238598, rhacm2/multicluster-operators-subscription-rhel9 1787240030
    fixed: vendor fix RHSA-2026:60389
show 6 more
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/multicluster-operators-application-rhel9 1787242135, rhacm2/multicluster-operators-subscription-rhel9 1787242321
    fixed: vendor fix RHSA-2026:60391
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/multicluster-operators-application-rhel9 1787242131, rhacm2/multicluster-operators-subscription-rhel9 1787242108
    fixed: vendor fix RHSA-2026:60386
  • Red Hat Multicluster Global Hub 1.4.9 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1788375682, multicluster-globalhub/multicluster-globalhub-operator-bundle 1788377695, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1788200958 Red Hat Multicluster Global Hub 1.5.8 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1789515639, multicluster-globalhub/multicluster-globalhub-operator-bundle 1789533983, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1789255903 Red Hat Multicluster Global Hub 1.6.6 multicluster-globalhub/multicluster-globalhub-grafana-rhel9 1790086248, multicluster-globalhub/multicluster-globalhub-operator-bundle 1790379995, multicluster-globalhub/multicluster-globalhub-postgres-exporter-rhel9 1790379115
    not affected: vulnerable code not present
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/search-collector-rhel9, rhacm2/cert-policy-controller-rhel9, rhacm2/config-policy-controller-rhel9, rhacm2/governance-policy-propagator-rhel9, rhacm2/acm-governance-policy-framework-addon-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat Advanced Cluster Management for Kubernetes 2.11 rhacm2/thanos-rhel9 1787685239, rhacm2/console-rhel9 1787687062, rhacm2/prometheus-rhel9 1787261499, rhacm2/acm-grafana-rhel9 1787682482, rhacm2/acm-search-v2-rhel9 1787688827, rhacm2/node-exporter-rhel9 1787263326, +33 more Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/thanos-rhel9 1787263906, rhacm2/acm-cli-rhel9 1787259085, rhacm2/console-rhel9 1787339249, rhacm2/prometheus-rhel9 1787263757, rhacm2/acm-grafana-rhel9 1787644958, rhacm2/acm-search-v2-rhel9 1787682112, +36 more Red Hat Advanced Cluster Management for Kubernetes 2.14 rhacm2/thanos-rhel9 1787614805, rhacm2/acm-cli-rhel9 1786923505, rhacm2/console-rhel9 1787339248, rhacm2/prometheus-rhel9 1786976997, rhacm2/acm-grafana-rhel9 1787645355, rhacm2/acm-search-v2-rhel9 1787682033, +36 more Red Hat Advanced Cluster Management for Kubernetes 2.15 rhacm2/thanos-rhel9 1787238739, rhacm2/acm-cli-rhel9 1787238522, rhacm2/console-rhel9 1787341780, rhacm2/prometheus-rhel9 1787238666, rhacm2/acm-grafana-rhel9 1787645007, rhacm2/acm-search-v2-rhel9 1787681674, +38 more Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/thanos-rhel9 1786909435, rhacm2/acm-cli-rhel9 1786908319, rhacm2/console-rhel9 1787339213, rhacm2/prometheus-rhel9 1786909036, rhacm2/acm-grafana-rhel9 1787645431, rhacm2/acm-search-v2-rhel9 1787681686, +39 more Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/thanos-rhel9 1787229716, rhacm2/acm-cli-rhel9 1787227626, rhacm2/console-rhel9 1787335105, rhacm2/prometheus-rhel9 1787230287, rhacm2/acm-grafana-rhel9 1787316467, rhacm2/acm-search-v2-rhel9 1787681651, +38 more
    not affected: vulnerable code not present
  • Red Hat OpenShift Container Platform 4 openshift4/lifecycle-agent-rhel9-operator, openshift4/lifecycle-agent-operator-bundle, openshift4/topology-aware-lifecycle-manager-aztp-rhel9, openshift4/topology-aware-lifecycle-manager-recovery-rhel8, openshift4/topology-aware-lifecycle-manager-recovery-rhel9, openshift4/topology-aware-lifecycle-manager-rhel8-operator, +1 more Red Hat Openshift Data Foundation 4 odf4/odf-cli-rhel9, odf4/odr-rhel9-operator, odf4/odf-multicluster-rhel9-operator
    not affected: vulnerable code not in execute path

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.69% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Red Hat Multicluster Global Hub 1.4.9
  • Red Hat Multicluster Global Hub 1.5.8
  • Red Hat Multicluster Global Hub 1.6.6
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat Openshift Data Foundation 4

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.