CVE-2026-66788
LOWDescription
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.
How to fix
This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 21% of all known CVEs.
References
Related Vulnerabilities
Other CWE-1104 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-7102 | Critical | 9.8 | 45% | - | - |
| CVE-2024-35252 | High | 7.5 | 2.5% | - | Fix |
| CVE-2021-22142 | Medium | 6.6 | 1.0% | - | Fix |
| CVE-2025-34192 | Critical | 9.8 | 1.0% | - | Fix |
| CVE-2022-46871 | High | 8.8 | 0.9% | - | Fix |
| CVE-2025-34193 | Critical | 9.8 | 0.8% | - | - |
Common questions
How do I fix CVE-2026-66788?
Published advisories record a fix for 10 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2026-66788 being actively exploited?
Not that we know of. CVE-2026-66788 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.28% is the estimated probability that it will be exploited in the next 30 days. That is higher than 21% of all scored CVEs.
How severe is CVE-2026-66788?
CVE-2026-66788 has a CVSS v3 base score of 3.7, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-66788 affect?
Published advisories record a fix for registry.redhat.io/rhacm2/lighthouse (Red Hat / RHEL), registry.redhat.io/rhacm2/lighthouse (Rocky), registry.redhat.io/rhacm2/nettest (Rocky), registry.redhat.io/rhacm2/nettest (Red Hat / RHEL), and 6 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-03.