Improper input validation in Red Hat Advanced Cluster Management for Kubernetes 2.11
Priority MEDIUM 42CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
A flaw was found in the governance-policy-addon-controller component of Red Hat Advanced Cluster Management for Kubernetes. A user with permissions to annotate the namespaced ManagedClusterAddOn resource can override the governance-policy container image. This allows an attacker to run a controlled image with cluster-admin privileges on the managed cluster, leading to arbitrary code execution and privilege escalation.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0081 57th percentileScored 2026-11-07
Fix Fixed Red Hat: 6 advisories
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.11 | — | 1787683327 | Patch available | CNA |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.13 | — | 1787259078 | Patch available | CNA |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.14 | — | 1787080755 | Patch available | CNA |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.15 | — | 1787238535 | Patch available | CNA |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.16 | — | 1787080753 | Patch available | CNA |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.17 | — | 1787227696 | Patch available | CNA |
- Red Hat Advanced Cluster Management for Kubernetes 2.11 VendorRed Hat Affected — Fixed in 1787683327 Patch available CNA
- Red Hat Advanced Cluster Management for Kubernetes 2.13 VendorRed Hat Affected — Fixed in 1787259078 Patch available CNA
- Red Hat Advanced Cluster Management for Kubernetes 2.14 VendorRed Hat Affected — Fixed in 1787080755 Patch available CNA
- Red Hat Advanced Cluster Management for Kubernetes 2.15 VendorRed Hat Affected — Fixed in 1787238535 Patch available CNA
- Red Hat Advanced Cluster Management for Kubernetes 2.16 VendorRed Hat Affected — Fixed in 1787080753 Patch available CNA
- Red Hat Advanced Cluster Management for Kubernetes 2.17 VendorRed Hat Affected — Fixed in 1787227696 Patch available CNA
CPE names CNA · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:/a:redhat:acm:2.11::el9 | 2.11 | — | Red Hat |
| cpe:/a:redhat:acm:2.13::el9 | 2.13 | — | Red Hat |
| cpe:/a:redhat:acm:2.14::el9 | 2.14 | — | Red Hat |
| cpe:/a:redhat:acm:2.15::el9 | 2.15 | — | Red Hat |
| cpe:/a:redhat:acm:2.16::el9 | 2.16 | — | Red Hat |
| cpe:/a:redhat:acm:2.17::el9 | 2.17 | — | Red Hat |
- cpe:/a:redhat:acm:2.11::el9 Versions 2.11 — ·Red Hat
- cpe:/a:redhat:acm:2.13::el9 Versions 2.13 — ·Red Hat
- cpe:/a:redhat:acm:2.14::el9 Versions 2.14 — ·Red Hat
- cpe:/a:redhat:acm:2.15::el9 Versions 2.15 — ·Red Hat
- cpe:/a:redhat:acm:2.16::el9 Versions 2.16 — ·Red Hat
- cpe:/a:redhat:acm:2.17::el9 Versions 2.17 — ·Red Hat
Remediation
Red Hat 6 advisories
- RHSA-2026:60391 Released 2026-08-26 · Red Hat rating ImportantRed Hat Advanced Cluster Management for Kubernetes v2.16.4 security update
- Red Hat Advanced Cluster Management for Kubernetes 2.16 registry.redhat.io/rhacm2/acm-governance-policy-addon-controller-rhel9, registry.redhat.io/rhacm2/acm-grafana-rhel9, registry.redhat.io/rhacm2/acm-multicluster-observability-addon-rhel9 +19
- RHSA-2026:60390 Released 2026-08-26 · Red Hat rating ImportantRed Hat Advanced Cluster Management for Kubernetes v2.13.11 security update
- Red Hat Advanced Cluster Management for Kubernetes 2.13 registry.redhat.io/rhacm2/acm-governance-policy-addon-controller-rhel9, registry.redhat.io/rhacm2/acm-grafana-rhel9, registry.redhat.io/rhacm2/acm-multicluster-observability-addon-rhel9 +23
- RHSA-2026:60388 Released 2026-08-26 · Red Hat rating ImportantRed Hat Advanced Cluster Management for Kubernetes v2.14.4 security update
- Red Hat Advanced Cluster Management for Kubernetes 2.14 registry.redhat.io/rhacm2/acm-governance-policy-addon-controller-rhel9, registry.redhat.io/rhacm2/acm-grafana-rhel9, registry.redhat.io/rhacm2/acm-multicluster-observability-addon-rhel9 +26
Show 3 more Red Hat advisories
- RHSA-2026:60389 Released 2026-08-26 · Red Hat rating ImportantRed Hat Advanced Cluster Management for Kubernetes v2.15.6 security update
- Red Hat Advanced Cluster Management for Kubernetes 2.15 registry.redhat.io/rhacm2/acm-governance-policy-addon-controller-rhel9, registry.redhat.io/rhacm2/acm-multicluster-observability-addon-rhel9, registry.redhat.io/rhacm2/acm-must-gather-rhel9 +19
- RHSA-2026:60387 Released 2026-08-26 · Red Hat rating ImportantRed Hat Advanced Cluster Management for Kubernetes v2.11.11 security update
- Red Hat Advanced Cluster Management for Kubernetes 2.11 registry.redhat.io/rhacm2/acm-governance-policy-addon-controller-rhel9, registry.redhat.io/rhacm2/acm-must-gather-rhel9, registry.redhat.io/rhacm2/acm-prometheus-config-reloader-rhel9 +24
- RHSA-2026:60386 Released 2026-08-26 · Red Hat rating ImportantRed Hat Advanced Cluster Management for Kubernetes v2.17.1 security update
- Red Hat Advanced Cluster Management for Kubernetes 2.17 registry.redhat.io/rhacm2/acm-governance-policy-addon-controller-rhel9, registry.redhat.io/rhacm2/acm-grafana-rhel9, registry.redhat.io/rhacm2/acm-multicluster-observability-addon-rhel9 +31
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Advanced Cluster Management for Kubernetes 2.11 | Fixed | RHSA-2026:60387 |
| Red Hat Advanced Cluster Management for Kubernetes 2.13 | Fixed | RHSA-2026:60390 |
| Red Hat Advanced Cluster Management for Kubernetes 2.14 | Fixed | RHSA-2026:60388 |
| Red Hat Advanced Cluster Management for Kubernetes 2.15 | Fixed | RHSA-2026:60389 |
| Red Hat Advanced Cluster Management for Kubernetes 2.16 | Fixed | RHSA-2026:60391 |
| Red Hat Advanced Cluster Management for Kubernetes 2.17 | Fixed | RHSA-2026:60386 |
Not affected: 6 products
- Red Hat Advanced Cluster Management for Kubernetes 2.11
- Red Hat Advanced Cluster Management for Kubernetes 2.13
- Red Hat Advanced Cluster Management for Kubernetes 2.14
- Red Hat Advanced Cluster Management for Kubernetes 2.15
- Red Hat Advanced Cluster Management for Kubernetes 2.16
- Red Hat Advanced Cluster Management for Kubernetes 2.17
Timeline
- 2026-10-02 Threatist record created from CVE-2026-66793
- 2026-10-03 Alias added: GHSA-xh6j-xcjj-j38g
References
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Sources
- CVE-2026-66793 · CVE Program
- CVE-2026-66793 · NVD
- FIRST EPSS
- GHSA-xh6j-xcjj-j38g · GitHub Advisory Database · CC BY 4.0
- CVE-2026-66793 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences