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Fencer Vulns
critical 9.9

CVE-2026-66788 json

Lighthouse: lighthouse: arbitrary namespace injection via attacker-controlled broker label

published 2026-08-20 2 mo ago modified 2026-10-19 20 d ago also EUVD-2026-63535

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 51%
public exploits
0
none known

Summary

A flaw was found in Lighthouse. A remote attacker, by compromising a spoke cluster, can exploit a vulnerability where the destination namespace for resource injection is derived from an attacker-controlled label or annotation on the broker object. This allows the attacker to inject unauthorized EndpointSlices and ServiceImports into any namespace on peer clusters, including critical system namespaces like kube-system and openshift-*. This could lead to privilege escalation or other forms of system compromise within the cluster.

Patch / fix

  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 1790670231, 1790670243, 1790670439, 1790670912
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 1788023916, 1788023940, 1788073481, 1788105072

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-2026-66788 updated cvss 9.9

lighthouse: lighthouse: arbitrary namespace injection via attacker-controlled broker label

  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/subctl-rhel9 1790670243, rhacm2/lighthouse-agent-rhel9 1790670439, rhacm2/lighthouse-coredns-rhel9 1790670231, rhacm2/submariner-rhel9-operator 1790670912
    fixed: vendor fix RHSA-2026:85227
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/subctl-rhel9 1788105072, rhacm2/lighthouse-agent-rhel9 1788023916, rhacm2/lighthouse-coredns-rhel9 1788023940, rhacm2/submariner-rhel9-operator 1788073481
    fixed: vendor fix RHSA-2026:63016
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/nettest-rhel9 1790702141, rhacm2/submariner-gateway-rhel9 1790670508, rhacm2/submariner-globalnet-rhel9 1790670233, rhacm2/submariner-operator-bundle 1790750775, rhacm2/submariner-route-agent-rhel9 1790670254 Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/nettest-rhel9 1788166791, rhacm2/submariner-gateway-rhel9 1788043964, rhacm2/submariner-globalnet-rhel9 1788043961, rhacm2/submariner-operator-bundle 1788217593, rhacm2/submariner-route-agent-rhel9 1788043970
    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
2 mo ago

Exploit prediction

0.66% chance of exploitation in the next 30 days, higher than 51% 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:L/I:H/A:H

Affected products

  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17

Classification

Weakness
  • CWE-1104 Use of Unmaintained Third Party Components

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.