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-2026-66795
Red Hat multicluster engine for Kubernetes 2.10 — Managedcluster-import-controller: csr auto-approver does not validate certificate subject or signername (spoke→hub cluster-admin)
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L L N C H H H 9.9 .0049 39.9 —
AFFECTED
Product Versions Fixed
multicluster engine for Kubernetes 2.10 unspecified 1787078272
multicluster engine for Kubernetes 2.11 unspecified 1787078330
multicluster engine for Kubernetes 2.17 unspecified 1786577915
multicluster engine for Kubernetes 2.6 unspecified 1787260779
multicluster engine for Kubernetes 2.8 unspecified 1787259044
multicluster engine for Kubernetes 2.9 unspecified 1787078307
TIMELINE
Jul 27 Reserved by redhat
Aug 17 Published (CNA: redhat)
Aug 25 PATCH SHIPPED — CVE-2026-66795 (Red Hat multicluster engine for Kubernetes 2.10). Fixed in multicluster engine for Kubernetes 2.10 1787078272.
Sep 1 RESCORED — CVE-2026-66795 (Red Hat multicluster engine for Kubernetes 2.10). CVSS 9.1 → 9.9 (NVD).
Description
A flaw was found in the managedcluster-import-controller. The Certificate Signing Request (CSR) auto-approval logic improperly validates incoming CSRs, specifically by not inspecting the signer name or decoding the PEM-encoded x509 CSR. This vulnerability allows a privileged service account on a spoke cluster to submit a malicious CSR. Successful exploitation can lead to privilege escalation, enabling the attacker to obtain administrative credentials on the hub cluster.
Lifecycle
Complete event history — 4 events, chronological
| Date | Event | Detail |
|---|
| July 27, 2026 | Reserved | Reserved by redhat |
| August 17, 2026 | Published | Published (CNA: redhat) |
| August 25, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-66795 (Red Hat multicluster engine for Kubernetes 2.10). Fixed in multicluster engine for Kubernetes 2.10 1787078272. |
| September 1, 2026 | RESCORED | RESCORED — CVE-2026-66795 (Red Hat multicluster engine for Kubernetes 2.10). CVSS 9.1 → 9.9 (NVD). |
Affected
Affected products and packages — 6 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | multicluster engine for Kubernetes 2.10 | — | — | 1787078272 |
| Red Hat | multicluster engine for Kubernetes 2.11 | — | — | 1787078330 |
| Red Hat | multicluster engine for Kubernetes 2.17 | — | — | 1786577915 |
| Red Hat | multicluster engine for Kubernetes 2.6 | — | — | 1787260779 |
| Red Hat | multicluster engine for Kubernetes 2.8 | — | — | 1787259044 |
| Red Hat | multicluster engine for Kubernetes 2.9 | — | — | 1787078307 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66795 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.
