CVE-2026-4740
Rhacm: open cluster management (ocm): cross-cluster privilege escalation via improper kubernetes client certificate renewal validation
HIGH 8.2
En bref
- Source
- NVD
- EPSS
- EPSS 0.15 % · centile 4 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- redhat
- Statut NVD
- Modified
Description
A flaw was found in Open Cluster Management (OCM), the technology underlying Red Hat Advanced Cluster Management (ACM). Improper validation of Kubernetes client certificate renewal allows a managed cluster administrator to forge a client certificate that can be approved by the OCM controller. This enables cross-cluster privilege escalation and may allow an attacker to gain control over other managed clusters, including the hub cluster.
Faiblesses (CWE)
- CWE-295 — Validation incorrecte de certificat
Références
- https://access.redhat.com/errata/RHSA-2026:11414
- https://access.redhat.com/errata/RHSA-2026:13542
- https://access.redhat.com/errata/RHSA-2026:13853
- https://access.redhat.com/errata/RHSA-2026:8218
- https://access.redhat.com/errata/RHSA-2026:9848
- https://access.redhat.com/security/cve/CVE-2026-4740
- https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape/
- https://bugzilla.redhat.com/show_bug.cgi?id=2450590
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4740.json
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.2 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | redhat |
| CVSS 3.1 | HIGH 8.2 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | redhat-SADP |
| CVSS 3.1 | HIGH 8.2 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | NVD · secalert@redhat.com (Secondary) |
| CVSS 3.1 | HIGH 8.2 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary) |
Avis
- GHSA-q4gv-pjmh-c735 — Open Cluster Management (OCM): Cross-cluster privilege escalation via improper Kubernetes client certificate renewal validation
- GO-2026-5564 — Open Cluster Management (OCM): Cross-cluster privilege escalation via improper Kubernetes client certificate renewal validation in open-cluster-management.io/ocm
Références européennes
- ENISA EUVD · EUVD-2026-19690
- GCVE · GCVE-0-2026-4740
Configurations affectées (CPE NVD)
cpe:2.3:a:redhat:advanced_cluster_management_for_kubernetes:-:*:*:*:*:*:*:*
Produits affectés
| Produit | Versions |
|---|---|
| Red Hat · multicluster engine for Kubernetes 2.1 | unaffected 1776881164 < * |
| Red Hat · multicluster engine for Kubernetes 2.11 | unaffected 1777478390 < * |
| Red Hat · multicluster engine for Kubernetes 2.6 | unaffected 1775977180 < * |
| Red Hat · multicluster engine for Kubernetes 2.8 | unaffected 1775638726 < * |
| Red Hat · multicluster engine for Kubernetes 2.9 | unaffected 1776445095 < * |
| Red Hat · Multicluster Engine for Kubernetes | |
| Red Hat · Multicluster Engine for Kubernetes | |
| Red Hat · Multicluster Engine for Kubernetes | |
| Red Hat · Multicluster Engine for Kubernetes | |
| Red Hat · Multicluster Engine for Kubernetes | |
| Red Hat · Multicluster Engine for Kubernetes |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |