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CVE-2026-10090— Multicluster-operators-subscription: multicluster-operators-subscription: namespace edit user can deploy cluster-scoped clusterrolebinding and become cluster-admin via application subscription

Quick assessment

Affected
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Red Hat Advanced Cluster Management for Kubernetes是美国Red Hat公司的一个Kubernetes多集群管理平台。 Red Hat Advanced Cluster Management for Kubernetes 2版本存在权限许可和访问控制问题漏洞，该漏洞源于Application Subscription控制器未验证订阅创建者是否具有“open-cluster-management:subscription-admin”角色且未限制应用资源到订阅

CVSS 9.0 · Critical EPSS 0.58% · P45
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I. Basic Information for CVE-2026-10090

Vulnerability Information
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Vulnerability Title
Multicluster-operators-subscription: multicluster-operators-subscription: namespace edit user can deploy cluster-scoped clusterrolebinding and become cluster-admin via application subscription
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
特权定义了不安全动作
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat Advanced Cluster Management for Kubernetes 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat Advanced Cluster Management for Kubernetes是美国Red Hat公司的一个Kubernetes多集群管理平台。 Red Hat Advanced Cluster Management for Kubernetes 2版本存在权限许可和访问控制问题漏洞，该漏洞源于Application Subscription控制器未验证订阅创建者是否具有“open-cluster-management:subscription-admin”角色且未限制应用资源到订阅
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11 1787263584 ~ * cpe:/a:redhat:acm:2.11::el9
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13 1787263693 ~ * cpe:/a:redhat:acm:2.13::el9
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14 1787170830 ~ * cpe:/a:redhat:acm:2.14::el9
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15 1787240030 ~ * cpe:/a:redhat:acm:2.15::el9
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 1787242321 ~ * cpe:/a:redhat:acm:2.16::el9
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 1787242108 ~ * cpe:/a:redhat:acm:2.17::el9

II. Public POCs for CVE-2026-10090

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III. Intelligence Information for CVE-2026-10090

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Vendor Advisories for CVE-2026-10090 (8)

Same Patch Batch · Red Hat · 2026-08-05 · 11 CVEs total

CVE-2026-10059 9.1 CRITICAL Cluster-curator-controller: cluster-curator-controller: namespace admin can escalate to cl
CVE-2026-15572 8.8 HIGH Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows p
CVE-2026-15573 8.1 HIGH Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching i
CVE-2026-16102 8.1 HIGH Keycloak-services: keycloak-services: default dcr policy allows role forgery via user prop
CVE-2026-16443 7.4 HIGH Keycloak-services: keycloak-services: saml broker metadata import disables response signat
CVE-2026-16442 7.4 HIGH Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only r
CVE-2026-16100 6.5 MEDIUM Keycloak-services: keycloak-services: unbounded metric cardinality in user event metrics v
CVE-2026-49331 6.5 MEDIUM Openshift/oauth-proxy: openshift/oauth-proxy: unauthenticated identity header injection on
CVE-2026-44605 5.5 MEDIUM Rpm: heap buffer overflow in ndb slot table parsing
CVE-2026-16071 5.4 MEDIUM Keycloak-services: keycloak-services: ldap entry-dn user search bypasses configured users

IV. Related Vulnerabilities

Same product: Red Hat Advanced Cluster Management for Kubernetes 2.11
Same vendor: Red Hat
Same weakness: CWE-267

V. Comments for CVE-2026-10090

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