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-2026-10090
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11 — Multicluster-operators-subscription: multicluster-operators-subscription: namespace edit user can deploy cluster-scoped clusterrolebinding and become cluster-admin via application subscription
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L H N C H H L 9.0 .0058 45.6 —
AFFECTED
Product Versions Fixed
Red Hat Advanced Cluster Management for Kubernetes 2.11 unspecified 1787263584
Red Hat Advanced Cluster Management for Kubernetes 2.13 unspecified 1787263693
Red Hat Advanced Cluster Management for Kubernetes 2.14 unspecified 1787170830
Red Hat Advanced Cluster Management for Kubernetes 2.15 unspecified 1787240030
Red Hat Advanced Cluster Management for Kubernetes 2.16 unspecified 1787242321
Red Hat Advanced Cluster Management for Kubernetes 2.17 unspecified 1787242108
TIMELINE
May 29 Reserved by redhat
Aug 5 Published (CNA: redhat)
Aug 26 PATCH SHIPPED — CVE-2026-10090 (Red Hat Advanced Cluster Management for Kubernetes 2.11). Fixed in Red Hat Advanced Cluster Management for Kubernetes 2.11 1787263584.
Description
A flaw was found in the Application Subscription controller (multicluster-operators-subscription) of Red Hat Advanced Cluster Management for Kubernetes (ACM). A user with namespace-scoped "edit" privileges in an ACM hub namespace can create a Channel resource pointing to a Helm repository they control and a Subscription resource referencing it. The app-subscription controller fetches and applies the Helm chart contents with its own elevated authority, without verifying whether the subscription creator holds the "open-cluster-management:subscription-admin" role and without restricting applied resources to the subscription namespace. This allows the attacker to include cluster-scoped resources in the Helm chart, such as a ClusterRoleBinding granting the attacker's ServiceAccount the "cluster-admin" ClusterRole. Successful exploitation results in full cluster-admin privilege escalation. This contradicts the ACM documentation which states that non-subscription-admin users should have resources deployed into the subscription namespace only.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| May 29, 2026 | Reserved | Reserved by redhat |
| August 5, 2026 | Published | Published (CNA: redhat) |
| August 26, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-10090 (Red Hat Advanced Cluster Management for Kubernetes 2.11). Fixed in Red Hat Advanced Cluster Management for Kubernetes 2.11 1787263584. |
Affected
Affected products and packages — 6 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.11 | — | — | 1787263584 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.13 | — | — | 1787263693 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.14 | — | — | 1787170830 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.15 | — | — | 1787240030 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.16 | — | — | 1787242321 |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | — | — | 1787242108 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-10090 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.
