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Advisory severityHigh7.7Red Hat Linux

High [CVE-2026-66878] FetchChannelReferences honours Channel.spec.secretRef.namespace enabling cross-namespace Secret exfiltration

This high-severity Red Hat Linux advisory covers CVE-2026-66878 affecting Red Hat Advanced Cluster Management for Kubernetes 2.11, Red Hat Advanced Cluster Management for Kubernetes 2.13, Red Hat Advanced Cluster Management for Kubernetes 2.14.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-66878 Source published Source updated

VulniPulse record published Record updated

CVE-2026-66878
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

A flaw was found in multicloud-operators-subscription. A privileged user, specifically a namespace administrator capable of creating Channel and Subscription resources, can exploit this vulnerability.

By manipulating the Channel. Spec.

SecretRef.Namespace field, the user can cause the system to copy sensitive Secret contents from other namespaces into their own, leading to information disclosure.

This Important flaw in Red Hat Advanced Cluster Management allows a malicious namespace administrator to exfiltrate sensitive Secret data from other namespaces within the cluster. This impacts environments where untrusted namespace administrators have permissions to create Channel and Subscription resources.

Red Hat severity: Important — CVSS 7.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N). Weakness: CWE-639.

Affected Red Hat products: Red Hat Advanced Cluster Management for Kubernetes 2.11; Red Hat Advanced Cluster Management for Kubernetes 2.13; Red Hat Advanced Cluster Management for Kubernetes 2.14; Red Hat Advanced Cluster Management for Kubernetes 2.15; Red Hat Advanced Cluster Management for Kubernetes 2.16; Red Hat Advanced Cluster Management for Kubernetes 2.17.

Red Hat fixing advisory: RHSA-2026:60387, RHSA-2026:60390, RHSA-2026:60388, RHSA-2026:60389, RHSA-2026:60391, RHSA-2026:60386.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 29 days ago·verify at source

Fixed versions
  • rhacm2/multicluster-operators-subscription-rhel9:1787263584
  • rhacm2/multicluster-operators-subscription-rhel9:1787263693
  • rhacm2/multicluster-operators-subscription-rhel9:1787170830
  • rhacm2/multicluster-operators-subscription-rhel9:1787240030
  • rhacm2/multicluster-operators-subscription-rhel9:1787242321
  • rhacm2/multicluster-operators-subscription-rhel9:1787242108
  • RHSA-2026:60387
  • RHSA-2026:60390
  • RHSA-2026:60388
  • RHSA-2026:60389
  • RHSA-2026:60391
  • RHSA-2026:60386

Official advisory · high-confidence parse· fetched 29 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Official advisory · high-confidence parse· fetched 29 days ago·verify at source

Discussion(0)

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