{"id":"CVE-2026-66787","title":"A flaw was found in the lighthouse component of Red Hat Advanced Cluster Management for Kubernetes","summary":"A flaw was found in the lighthouse component of Red Hat Advanced Cluster Management for Kubernetes. This vulnerability stems from insufficient validation of advertised IP addresses within EndpointSlice objects. A compromised spoke cluste…","severity":"high","cvss":8.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N","cwe":["CWE-345"],"published":"2026-08-20","updated":"2026-10-12","sourceUpdated":"2026-10-12T22:17:05.020","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-66787","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:63016","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-66787","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2507532","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:85227","label":"RHSA-2026:85227"}],"tags":["nvd","cve.org"],"epss":0.00298,"epssPercentile":0.22357,"ingestedAt":"2026-10-12T23:07:25.620Z","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":"2026-08-20T18:51:33.566517Z"},"slug":"CVE-2026-66787","body":"## Overview\n\nA flaw was found in the lighthouse component of Red Hat Advanced Cluster Management for Kubernetes. This vulnerability stems from insufficient validation of advertised IP addresses within EndpointSlice objects. A compromised spoke cluster can exploit this by creating EndpointSlices with attacker-controlled IP addresses, causing other clusters' lighthouse DNS to redirect legitimate service traffic to malicious endpoints. This enables a remote attacker to conduct transparent Man-in-the-Middle (MITM) attacks on cross-cluster service communications, potentially leading to unauthorized information disclosure and data manipulation.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}