CVE-2026-66780Network attack vector

Mesh traffic redirection via overbroad broker role

Published Aug 18, 2026 · Updated Aug 18, 2026

Access control flaw in Red Hat Advanced Cluster Management for Kubernetes allows remote authenticated users to redirect inter-cluster traffic. The submariner-k8s-broker-cluster Role assigned to joined clusters grants write access in the broker namespace, so one spoke can overwrite other clusters' endpoint records and related network objects. Exploitation requires control of a joined cluster or its credentials; that access is enough to reroute tunnel traffic across the mesh for man-in-the-middle interception and tampering.

CVSS severity9.9
Critical
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access control flaw in Red Hat Advanced Cluster Management for Kubernetes allows remote authenticated users to redirect inter-cluster traffic. The submariner-k8s-broker-cluster Role assigned to joined clusters grants write access in the broker namespace, so one spoke can overwrite other clusters' endpoint records and related network objects. Exploitation requires control of a joined cluster or its credentials; that access is enough to reroute tunnel traffic across the mesh for man-in-the-middle interception and tampering.

The record

CVE
CVE-2026-66780
Published
Aug 18, 2026
Updated
Aug 18, 2026
Vendor
389 Directory Server
Product
Red Hat Advanced Cluster Management for Kubernetes
Classifications
CWE-284, T1557
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat Advanced Cluster Management for KubernetesAffected versions are unavailable in this record.

Published CVSS scores

9.9NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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