# CVE-2026-66788

## Summary

- **CVE ID:** CVE-2026-66788
- **Severity:** LOW
- **CVSS Score:** 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N)
- **CWE:** CWE-284, CWE-1104
- **Published:** Aug 20, 2026
- **Last Modified:** Sep 3, 2026

## 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

- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788023916)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788023940)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788105072)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1788073481)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-66788)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2507533)
- [CNA](https://access.redhat.com/errata/RHSA-2026:63016)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 20.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._