CVE-2026-66787: high-severity vulnerability in Red Hat Advanced Cluster Management for…
Lighthouse: lighthouse: cross-cluster dns spoofing via unvalidated endpointslice ip addresses
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.3%
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.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
Affected products
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17Related CVEs — Red Hat Advanced Cluster Management for…
In the same product, most dangerous first.
CVE-2026-66786CRITICALSubmariner: submariner: ipsec.conf stanza injection via remote-supplied cablename and subnetsEPSS 1.4%CVE-2026-71471CRITICALAcm-search-v2-rhel9: search-v2-operator: hub search cr collector.imageoverride propagated to every spoke as arbitrary container imageEPSS 1.2%CVE-2026-71472CRITICALAcm-search-v2-rhel9: search-v2-operator: shell-command and sql injection in postgresql-start.sh via cr-supplied work_memEPSS 0.9%CVE-2026-71467HIGHAcm-search-v2-api-rhel9: search-v2-api: authentication bypass on /federated via upgrade: websocket header spoofingEPSS 0.8%CVE-2026-66793HIGHGovernance-policy-addon-controller: governance-policy-addon-controller: arbitrary container image override via managedclusteraddon annotation enables rce on spokeEPSS 0.8%CVE-2026-72508CRITICALMulticloud-operators-subscription: multicloud-operators-subscription: hub and spoke serviceaccounts bound to wildcard rbac (*/*/*)EPSS 0.8%