CVE-2026-10090
ACM app-subscription allows namespace user to escalate to cluster-admin via malicious Helm chart
Is CVE-2026-10090 being exploited?
Not confirmed. CVE-2026-10090 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-10090?
CVE-2026-10090 is rated Critical with a CVSS score of 9.9. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-10090?
Yes. A fix has been recorded for CVE-2026-10090. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-10090 affect?
CVE-2026-10090 affects Red Hat Advanced Cluster Management (ACM) for Kubernetes, app-subscription controller (multicluster-operators-subscription). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-10090?
Revoke untrusted namespace edit rights, remove external Subscriptions, audit RBAC; apply vendor patch when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Namespace-scoped 'edit' user can cause controller to apply cluster-scoped resources (e.g., ClusterRoleBinding) and obtain cluster-admin privileges.
Immediate action required