# CVE-2026-10090

## Summary

- **CVE ID:** CVE-2026-10090
- **Severity:** CRITICAL
- **CVSS Score:** 9 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L)
- **CWE:** CWE-267
- **Published:** Aug 5, 2026
- **Last Modified:** Sep 8, 2026

## 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.

## Affected Products

- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.13 (1787263693)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.15 (1787240030)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.17 (1787242108)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.11 (1787263584)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.14 (1787170830)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.16 (1787242321)
- Red Hat — Red Hat Advanced Cluster Management for Kubernetes 2.14.0 (1787170830)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-10090)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2483292)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60386)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60389)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60390)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60387)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60388)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60391)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.36%
- **EPSS Percentile:** 29.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._