---
id: CVE-2026-66788
title: A flaw was found in Lighthouse
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 brok…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H'
cwe:
  - CWE-1104
published: '2026-08-20'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T20:17:09.960'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-66788'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:63016'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-66788'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2507533'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:85227'
    label: 'RHSA-2026:85227'
tags:
  - nvd
  - cve.org
epss: 0.00658
epssPercentile: 0.51272
ingestedAt: '2026-10-12T21:04:28.911Z'
vendor: Red Hat
product: rhacm2/lighthouse-agent-rhel9
affected:
  - rhacm2/lighthouse-agent-rhel9 (all versions)
  - rhacm2/lighthouse-coredns-rhel9 (all versions)
  - rhacm2/subctl-rhel9 (all versions)
  - rhacm2/submariner-rhel9-operator (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-20T18:52:23.727449Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.