CVE-2026-66792Network attack vector

Cluster-admin escalation via trusted user-settable annotations

Published Aug 17, 2026 · Updated Aug 20, 2026

Incorrect authorization in Red Hat multicloud-operators-subscription allows remote authenticated users to gain cluster-admin privileges. On managed clusters without the identity-stamping webhook, IsClusterAdmin returns true when a Subscription carries any nonempty hosting-subscription annotation and cluster-admin set to true. Any managed-cluster user able to create a Subscription can deploy resources into arbitrary namespaces with the controller's Service Account.

CVSS severity9.9
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Red Hat multicloud-operators-subscription allows remote authenticated users to gain cluster-admin privileges. On managed clusters without the identity-stamping webhook, IsClusterAdmin returns true when a Subscription carries any nonempty hosting-subscription annotation and cluster-admin set to true. Any managed-cluster user able to create a Subscription can deploy resources into arbitrary namespaces with the controller's Service Account.

The record

CVE
CVE-2026-66792
Published
Aug 17, 2026
Updated
Aug 20, 2026
Vendor
389 Directory Server
Product
Red Hat Advanced Cluster Management for Kubernetes
Classifications
CWE-863, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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.
389 Directory Server · Multicluster Global HubAffected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4Affected versions are unavailable in this record.

Published CVSS scores

9.9Red HatCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1068Exploitation for Privilege Escalation

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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