{"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"],"slug":"CVE-2026-10090","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **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)\n- **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)\n- **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)\n- **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)\n- **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)\n- **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)","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":49.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}