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-2026-66783
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 — Submariner-operator: release workflow consumes same-org composite action via mutable @devel branch ref
AV AC PR UI S C I A CVSS EPSS %ile KEV
N H H N C L L N 4.4 .0035 26.4 —
AFFECTED
Product Versions Fixed
Red Hat Advanced Cluster Management for Kubernetes 2.17 unspecified 1788105072
Red Hat Advanced Cluster Management for Kubernetes 2.17 unspecified 1788073481
Red Hat Advanced Cluster Management for Kubernetes 2 unspecified —
Red Hat Advanced Cluster Management for Kubernetes 2 unspecified —
TIMELINE
Jul 27 Reserved by redhat
Aug 18 Published (CNA: redhat)
Sep 1 RESCORED — CVE-2026-66783 (Red Hat Advanced Cluster Management for Kubernetes 2). CVSS 8.2 → 4.4 (NVD).
Sep 2 PATCH SHIPPED — CVE-2026-66783 (Red Hat Advanced Cluster Management for Kubernetes 2.17). Fixed in Red Hat Advanced Cluster Management for Kubernetes 2.17 1788105072.
Description
A flaw was found in the `submariner-operator` component of Red Hat Advanced Cluster Management for Kubernetes. This vulnerability allows a cluster administrator, or any user with permissions to modify the Submariner Custom Resource (CR), to specify an unvalidated image path. This lack of validation enables an attacker to execute arbitrary code with elevated privileges across the entire cluster, including control-plane nodes, by deploying a malicious image.
Lifecycle
Complete event history — 4 events, chronological
| Date | Event | Detail |
|---|
| July 27, 2026 | Reserved | Reserved by redhat |
| August 18, 2026 | Published | Published (CNA: redhat) |
| September 1, 2026 | RESCORED | RESCORED — CVE-2026-66783 (Red Hat Advanced Cluster Management for Kubernetes 2). CVSS 8.2 → 4.4 (NVD). |
| September 2, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-66783 (Red Hat Advanced Cluster Management for Kubernetes 2.17). Fixed in Red Hat Advanced Cluster Management for Kubernetes 2.17 1788105072. |
Affected
Affected products and packages — 4 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | — | — | 1788105072 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | — | — | 1788073481 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2 | — | — | — |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2 | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-66783 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.
