Rhacm: open cluster management (ocm): cross-cluster privilege escalation via improper kubernetes client certificate renewal validation
Collected exploitation and prediction evidence
Risk source coverageCISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.
No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.
cve-program · CVE-2026-4740
PublishedA 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.
- Source published
- 7 Apr 2026 14:30:36 UTC
- Source modified
- 9 Sep 2026 12:04:44 UTC
- Observed here
- 23 Oct 2026 15:48:27 UTC
- Source terms
- CVE Program Terms of Use
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CVSS 3.1 · 8.2 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
euvd · EUVD-2026-19690
PublishedA 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.
EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.
Original publisher date fields
datePublished: Apr 7, 2026, 2:30:36 PM
dateUpdated: Sep 9, 2026, 12:04:44 PM
5 related source bulletins · separate from aliases
RHSA-2026:9848: Red Hat Security Advisory: multicluster engine for Kubernetes v2.6.10 security update
CVE-2025-13465 · CVE-2025-61726 · CVE-2025-61729 · CVE-2025-68121 · CVE-2026-4740 · CVE-2026-22029 · CVE-2026-25639 · CVE-2026-29063
RHSA-2026:8218: Red Hat Security Advisory: multicluster engine for Kubernetes v2.8.5 security update
CVE-2025-13465 · CVE-2025-47907 · CVE-2025-58183 · CVE-2025-61726 · CVE-2025-61729 · CVE-2025-68121 · CVE-2026-4740 · CVE-2026-22029 · CVE-2026-25639 · CVE-2026-29063
RHSA-2026:13542: Red Hat Security Advisory: multicluster engine for Kubernetes v2.10.2 security update
CVE-2025-13465 · CVE-2025-58183 · CVE-2025-61726 · CVE-2025-61729 · CVE-2025-68121 · CVE-2026-4740 · CVE-2026-22029 · CVE-2026-25639 · CVE-2026-29063 · CVE-2026-40175
RHSA-2026:13853: Red Hat Security Advisory: multicluster engine for Kubernetes v2.11.1 security update
CVE-2026-4740 · CVE-2026-29063
RHSA-2026:11414: Red Hat Security Advisory: multicluster engine for Kubernetes v2.9.3 security update
CVE-2025-13465 · CVE-2025-61726 · CVE-2025-68121 · CVE-2026-4740 · CVE-2026-25639 · CVE-2026-29063 · CVE-2026-40175
- Source published
- Apr 7, 2026, 2:30:36 PM (timezone not stated)
- Source modified
- Sep 9, 2026, 12:04:44 PM (timezone not stated)
- Observed here
- 28 Oct 2026 06:17:50 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
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EUVD CVSS 3.1 · 8.2 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
nvd · CVE-2026-4740
PublishedA 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.
NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.
Source analysis status: Modified
Weakness classifications: CWE-295
Original publisher date fields
published: 2026-04-07T15:17:46.797
lastModified: 2026-10-26T21:10:00.170
1 source CPE criteria · context only
- cpe:2.3:a:redhat:advanced_cluster_management_for_kubernetes:-:*:*:*:*:*:*:*
The original JSON retains the logical configuration operators, exclusions and version bounds.
- Source published
- 7 Apr 2026 15:17:46 UTC
- Source modified
- 26 Oct 2026 21:10:00 UTC
- Observed here
- 27 Oct 2026 13:11:48 UTC
- Source terms
- NIST NVD usage terms; underlying source attribution retained
Original source record · Cite this exact observation · Complete original publisher JSON
This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.
CVSS 3.1 · [email protected] · Secondary · 8.2 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS 3.1 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c · Secondary · 8.2 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
osv · GHSA-q4gv-pjmh-c735
PublishedA 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.
- Source published
- 7 Apr 2026 15:30:52 UTC
- Source modified
- 25 Jun 2026 23:11:37 UTC
- Observed here
- 24 Oct 2026 13:19:41 UTC
- Source terms
- GitHub Advisory Database · CC-BY-4.0
Original source record · Cite this exact observation · Complete original publisher JSON
This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.
CVSS_V3 · CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Publisher rating · HIGH
osv · GO-2026-5564
PublishedOpen Cluster Management (OCM): Cross-cluster privilege escalation via improper Kubernetes client certificate renewal validation in open-cluster-management.io/ocm
- Source published
- 25 Jun 2026 22:34:34 UTC
- Source modified
- 25 Jun 2026 23:01:31 UTC
- Observed here
- 24 Oct 2026 13:19:41 UTC
- Source terms
- OSV · upstream source license applies
Original source record · Cite this exact observation · Complete original publisher JSON
This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.