CVE-2026-4740
OCM cross-cluster privilege escalation via forged Kubernetes certs.
Is CVE-2026-4740 being exploited?
Not confirmed. CVE-2026-4740 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.15% probability of exploitation in the next 30 days.
How severe is CVE-2026-4740?
CVE-2026-4740 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-4740?
Yes. A fix has been recorded for CVE-2026-4740. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-4740 affect?
CVE-2026-4740 affects Open Cluster Management (OCM), Red Hat ACM, Kubernetes management plane. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-4740?
Patch when released; rotate certificates; restrict admin access
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Cross-cluster privilege escalation; attacker may gain control of hub and other managed clusters.
Patch when possible