Cluster-curator-controller: cluster-curator-controller: spec.install.overridejob allows arbitrary job spec injection
Summary
| CVE | CVE-2026-73268 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-12 20:17:53 UTC |
| Updated | 2026-09-05 15:17:30 UTC |
| Description | A flaw was found in the cluster-curator-controller component of multicluster engine (MCE). A tenant with create or update permissions on ClusterCurator resources can inject an arbitrary Job specification. This is possible because the CreateJob() function does not validate user-controlled input when unmarshaling the spec.install.overrideJob raw extension. Successful exploitation allows the injected Job to run with the controller's elevated privileges, leading to arbitrary code execution and privilege escalation, potentially accessing cluster-wide secrets. |
Risk And Classification
Primary CVSS: v3.1 9.9 CRITICAL from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS: 0.004680000 probability, percentile 0.388160000 (date 2026-09-05)
Problem Types: CWE-94 | CWE-94 Improper Control of Generation of Code ('Code Injection')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 9.9 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 9.9 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
ChangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Multicluster Engine For Kubernetes 2.1 | unaffected 1787201612 * rpm | Not specified |
| CNA | Red Hat | Multicluster Engine For Kubernetes 2.11 | unaffected 1787238383 * rpm | Not specified |
| CNA | Red Hat | Multicluster Engine For Kubernetes 2.17 | unaffected 1786750700 * rpm | Not specified |
| CNA | Red Hat | Multicluster Engine For Kubernetes 2.6 | unaffected 1787264185 * rpm | Not specified |
| CNA | Red Hat | Multicluster Engine For Kubernetes 2.8 | unaffected 1787259011 * rpm | Not specified |
| CNA | Red Hat | Multicluster Engine For Kubernetes 2.9 | unaffected 1787201646 * rpm | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:59593 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:59556 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:59557 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:59579 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2026:59558 | [email protected] | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:59559 | [email protected] | access.redhat.com | |
| access.redhat.com/security/cve/CVE-2026-73268 | [email protected] | access.redhat.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-08-10T00:00:00.000Z | Reported to Red Hat. |
| CNA | 2026-08-11T00:00:00.000Z | Made public. |
Workarounds
CNA: To mitigate this issue, implement strict Role-Based Access Control (RBAC) policies to limit create and update permissions on `clustercurators.cluster.open-cluster-management.io` resources to trusted administrators only. This restricts the ability of less privileged tenants to exploit the vulnerability and escalate privileges within the Kubernetes environment.
There are currently no legacy QID mappings associated with this CVE.