CVE-2026-66788
Lighthouse: lighthouse: arbitrary namespace injection via attacker-controlled broker label
- Published
- Updated
- Reserved
- Assigned by
- redhat
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.
Timeline
ID reserved
By redhat
- 24 days later
· 24 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | Critical9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | Critical9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.66% · top 48% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.9.
Weakness
Affected products
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16
- unaffected 1790670439 – < *
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16
- unaffected 1790670231 – < *
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16
- unaffected 1790670243 – < *
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16
- unaffected 1790670912 – < *
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17
- unaffected 1788023916 – < *
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17
- unaffected 1788023940 – < *
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17
- unaffected 1788105072 – < *
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17
- unaffected 1788073481 – < *
What to do
Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
References (4)
- RHSA-2026:63016 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:85227 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-66788 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2507533 (opens in a new tab)issue-trackingx_refsource_REDHAT
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-66788)Record last updated .