---
id: CVE-2026-10090
title: >-
  A flaw was found in the Application Subscription controller
  (multicluster-operators-subscription) of Red Hat Advanced Cluster Management
  for Kubernetes (ACM)
summary: >-
  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 cre…
severity: critical
cvss: 9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L'
cwe:
  - CWE-267
vendor: Red Hat
product: rhacm2/multicluster-operators-subscription-rhel9
affected:
  - rhacm2/multicluster-operators-subscription-rhel9 (all versions)
  - rhacm2/multicluster-operators-subscription-rhel9 (all versions)
  - rhacm2/multicluster-operators-subscription-rhel9 (all versions)
  - rhacm2/multicluster-operators-subscription-rhel9 (all versions)
  - rhacm2/multicluster-operators-subscription-rhel9 (all versions)
  - rhacm2/multicluster-operators-subscription-rhel9 (all versions)
published: '2026-08-05'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T14:17:20.337'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-10090'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:60386'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60387'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60388'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60389'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60390'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:60391'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-10090'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2483292'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10090.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-10090'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-10090'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-05T13:49:40.960456Z'
epss: 0.00365
epssPercentile: 0.30345
ingestedAt: '2026-09-05T15:41:16.436Z'
patched:
  - advanced_cluster_management_for_kubernetes 2.11
  - advanced_cluster_management_for_kubernetes 2.13
  - advanced_cluster_management_for_kubernetes 2.14
  - advanced_cluster_management_for_kubernetes 2.15
  - advanced_cluster_management_for_kubernetes 2.16
  - advanced_cluster_management_for_kubernetes 2.17
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:60387** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.11 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60387)
- **RHSA-2026:60390** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.13 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60390)
- **RHSA-2026:60388** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.14 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60388)
- **RHSA-2026:60389** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.15 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60389)
- **RHSA-2026:60391** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.16 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60391)
- **RHSA-2026:60386** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.17 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:60386)