CVE•Published 2026-04-07•Modified 2026-06-30•1 article on news•6 live references•NVD data
CVE-2026-4740Redhat · Advanced_cluster_management_for_kubernetes
Vulnerability data via NVD (ingested)
CVSS v3.1
8.2
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS percentile
1
Exploit Prediction Scoring System · top 99% of all CVEs
Weaknesses (CWE)
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.
Timeline
Published 2026-04-07
Modified 2026-06-30
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-4740Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Redhat Advanced Cluster Management For Kubernetes"All exposed Redhat Advanced Cluster Management For Kubernetes instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Advanced Cluster Management For Kubernetes"HTTP body or banner mentions "Advanced Cluster Management For Kubernetes" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-4740Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-4740Censys host search filtered to this CVE id.
grep.app
CVE-2026-4740Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-4740GitHub code search for direct mentions.
Google dork
"CVE-2026-4740" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub (6)
CVE-2026-47406 repos
YgorAlberto/ygoralberto.github.ioShell
hiifong/starListPython
Export your star's repository list
hugefiver/mystarsunknown
oslook/n8n-workflowsunknown
4200 + Workflow Automation Templates are Grouped by Categories/Services for easy navigation
Krishcalin/Detection-Engineeringunknown
Security Operation Center (SOC) attack detection and response
platinum2high/ioc-hunterPython
Async threat intelligence correlation engine. Auto-parses IOCs from raw text, enriches them across 6 TI feeds in parallel, exports STIX/MISP/Sigma/Suricata. Works keyless out of th…