{"id":"CVE-2026-66787","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-66787","generatedAt":"2026-10-28T02:18:28.084Z","title":"This vulnerability stems from insufficient validation of advertised IP addresses within EndpointSlice objects.","description":"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 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.","published":"2026-08-20T19:16:59.000Z","lastModified":"2026-10-19T17:17:21.000Z","status":"Awaiting Analysis","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":8.7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N"},"cwe":["CWE-345"],"affected":[],"epss":{"score":0.00298,"percentile":0.22296,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.30%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-10-12T22:45:03.000Z","detail":{"from":"5.4","score":"8.7","severity":"HIGH","fromSeverity":"MEDIUM"},"summary":"Now scored CVSS 8.7 HIGH (was 5.4)."}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:63016","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:85227","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-66787","source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2507532","source":"secalert@redhat.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-66787","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}