Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-66794
Red Hat multicluster engine for Kubernetes 2.10 — Cluster-proxy-addon: cluster-proxy-addon: unauthenticated ssrf to arbitrary managed-cluster services via public route
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L N N C H L N 9.3 .0062 47.9 —
AFFECTED
Product Versions Fixed
multicluster engine for Kubernetes 2.10 unspecified 1787173361
multicluster engine for Kubernetes 2.11 unspecified 1787276784
multicluster engine for Kubernetes 2.17 unspecified 1786983349
multicluster engine for Kubernetes 2.6 unspecified 1787275318
multicluster engine for Kubernetes 2.8 unspecified 1787275519
multicluster engine for Kubernetes 2.9 unspecified 1787274923
TIMELINE
Jul 27 Reserved by redhat
Aug 19 Published (CNA: redhat)
Aug 25 PATCH SHIPPED — CVE-2026-66794 (Red Hat multicluster engine for Kubernetes 2.10). Fixed in multicluster engine for Kubernetes 2.10 1787173361.
Description
A flaw was found in the `cluster-proxy-addon` component of Multicluster Engine for Kubernetes. This vulnerability allows an unauthenticated attacker, who can access the user-facing route, to bypass authentication and authorization checks. By manipulating URL path segments, the attacker can proxy requests to arbitrary services across any managed cluster. This enables unauthorized access to internal services that would otherwise be protected, potentially leading to information disclosure or further compromise of the cluster environment.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| July 27, 2026 | Reserved | Reserved by redhat |
| August 19, 2026 | Published | Published (CNA: redhat) |
| August 25, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-66794 (Red Hat multicluster engine for Kubernetes 2.10). Fixed in multicluster engine for Kubernetes 2.10 1787173361. |
Affected
Affected products and packages — 6 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | multicluster engine for Kubernetes 2.10 | — | — | 1787173361 |
| Red Hat | multicluster engine for Kubernetes 2.11 | — | — | 1787276784 |
| Red Hat | multicluster engine for Kubernetes 2.17 | — | — | 1786983349 |
| Red Hat | multicluster engine for Kubernetes 2.6 | — | — | 1787275318 |
| Red Hat | multicluster engine for Kubernetes 2.8 | — | — | 1787275519 |
| Red Hat | multicluster engine for Kubernetes 2.9 | — | — | 1787274923 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66794 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
