Log in Start free

Vulnerability · Published Aug 20, 2026 · Assigned by redhat

CVE-2026-66788Lighthouse: lighthouse: arbitrary namespace injection via attacker-controlled broker label

Critical 9.9

In plain English

A critical-severity security flaw in Red Hat Advanced Cluster Management for Kubernetes 2.16 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).

Severity (CVSS 3.1)9.9Critical
Exploit odds (30 days)0.7%top 48.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references

Weakness: CWE-1104 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H

References