CVE-2026-71299Network attack vectorHinoki check available

Unauthorized writes via unprotected REST endpoints

Published Oct 5, 2026 · Updated Oct 5, 2026

Authentication bypass in the Maestro REST API within Red Hat Multicluster Engine for Kubernetes allows remote attackers to alter cluster data. The consumer and resource-bundle write routes were registered without authentication middleware, so they process create, modify, or delete requests without verifying the caller. Exploitation requires network access to the REST API; unauthorized changes can damage cluster-management data or interrupt service.

CVSS severityUnavailable
Unscored
EPSS probability0.31%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication bypass in the Maestro REST API within Red Hat Multicluster Engine for Kubernetes allows remote attackers to alter cluster data. The consumer and resource-bundle write routes were registered without authentication middleware, so they process create, modify, or delete requests without verifying the caller. Exploitation requires network access to the REST API; unauthorized changes can damage cluster-management data or interrupt service.

The record

CVE
CVE-2026-71299
Published
Oct 5, 2026
Updated
Oct 5, 2026
Vendor
libuser Project
Product
Multicluster Engine for Kubernetes
Classifications
T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 5, 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 privilegesunauthenticated

What is affected?

libuser Project · Multicluster Engine for KubernetesAffected versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1565.001Stored Data Manipulation

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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