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Fencer Vulns
critical 9.1

CVE-2026-10059 json

Cluster-curator-controller: cluster-curator-controller: namespace admin can escalate to cluster-wide curator authority via clustercurator serviceaccount token

published 2026-08-05 3 mo ago modified 2026-10-23 16 d ago also EUVD-2026-53293

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

A flaw was found in the Multicluster Engine for Kubernetes ClusterCurator controller. A tenant administrator with namespace-scoped privileges can exploit this vulnerability by creating a namespaced ClusterCurator. This action inadvertently grants the tenant administrator the ability to mint a token for a ServiceAccount with cluster-wide administrative authority. This leads to a privilege escalation, allowing the tenant administrator to gain full control over the cluster.

Patch / fix

  • Red Hat multicluster engine for Kubernetes 2.1 1787201612
  • Red Hat multicluster engine for Kubernetes 2.11 1787238383
  • Red Hat multicluster engine for Kubernetes 2.6 1787264185
  • Red Hat multicluster engine for Kubernetes 2.8 1787259011
  • Red Hat multicluster engine for Kubernetes 2.9 1787201646

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-2026-10059 updated cvss 9.1

cluster-curator-controller: cluster-curator-controller: namespace admin can escalate to cluster-wide curator authority via ClusterCurator ServiceAccount token

  • Red Hat multicluster engine for Kubernetes 2.1 multicluster-engine/cluster-curator-controller-rhel9 1787201612
    fixed: vendor fix RHSA-2026:59557
  • Red Hat multicluster engine for Kubernetes 2.6 multicluster-engine/cluster-curator-controller-rhel9 1787264185
    fixed: vendor fix RHSA-2026:59579
  • Red Hat multicluster engine for Kubernetes 2.8 multicluster-engine/cluster-curator-controller-rhel9 1787259011
    fixed: vendor fix RHSA-2026:59558
  • Red Hat multicluster engine for Kubernetes 2.9 multicluster-engine/cluster-curator-controller-rhel9 1787201646
    fixed: vendor fix RHSA-2026:59559
  • Red Hat multicluster engine for Kubernetes 2.11 multicluster-engine/cluster-curator-controller-rhel9 1787238383
    fixed: vendor fix RHSA-2026:59556
  • Red Hat multicluster engine for Kubernetes 2.1 multicluster-engine/hive-rhel9 1787205371, multicluster-engine/work-rhel9 1786933256, multicluster-engine/discovery-rhel9 1787071404, multicluster-engine/placement-rhel9 1786548467, multicluster-engine/console-mce-rhel9 1787079364, multicluster-engine/must-gather-rhel9 1786548899, +24 more Red Hat multicluster engine for Kubernetes 2.6 multicluster-engine/hive-rhel9 1787291123, multicluster-engine/work-rhel9 1787263188, multicluster-engine/discovery-rhel9 1787263531, multicluster-engine/placement-rhel9 1787260699, multicluster-engine/console-mce-rhel9 1787264250, multicluster-engine/must-gather-rhel9 1787264198, +20 more Red Hat multicluster engine for Kubernetes 2.8 multicluster-engine/hive-rhel9 1787291250, multicluster-engine/work-rhel9 1787259113, multicluster-engine/discovery-rhel9 1787259074, multicluster-engine/placement-rhel9 1787259108, multicluster-engine/console-mce-rhel9 1787259048, multicluster-engine/must-gather-rhel9 1787258992, +20 more Red Hat multicluster engine for Kubernetes 2.9 multicluster-engine/hive-rhel9 1787205132, multicluster-engine/work-rhel9 1786933545, multicluster-engine/discovery-rhel9 1786658519, multicluster-engine/placement-rhel9 1786491555, multicluster-engine/console-mce-rhel9 1787079359, multicluster-engine/must-gather-rhel9 1786837240, +23 more Red Hat multicluster engine for Kubernetes 2.11 multicluster-engine/hive-rhel9 1787291933, multicluster-engine/work-rhel9 1786907276, multicluster-engine/discovery-rhel9 1786911975, multicluster-engine/placement-rhel9 1786911984, multicluster-engine/console-mce-rhel9 1787065052, multicluster-engine/must-gather-rhel9 1786911926, +25 more
    not affected: vulnerable code not present

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
3 mo ago

Exploit prediction

0.64% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Red Hat multicluster engine for Kubernetes 2.1
  • Red Hat multicluster engine for Kubernetes 2.11
  • Red Hat multicluster engine for Kubernetes 2.6
  • Red Hat multicluster engine for Kubernetes 2.8
  • Red Hat multicluster engine for Kubernetes 2.9

Classification

Weakness
  • CWE-266 Incorrect Privilege Assignment

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.