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Advisory severityMedium6.4Red Hat Linux

Medium [CVE-2026-64927] cross-namespace Secret and ConfigMap mutation via spec.secretRef.namespace confused deputy

This medium-severity Red Hat Linux advisory covers CVE-2026-64927 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-2026-64927 Source published Source updated

VulniPulse record published Record updated

CVE-2026-64927
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

A flaw was found in the multicloud-operators-channel component. This vulnerability allows a user with specific permissions to manipulate how the system handles sensitive information, known as Secrets, across different parts of the system (namespaces).

By exploiting this, an attacker can modify these Secrets in unauthorized areas. This could lead to unauthorized access to information or elevated privileges within the system.

This enables cross-namespace Secret mutation and backup-scope expansion, indicating a privilege escalation within the cluster. Red Hat severity: Moderate — CVSS 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/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 1 day ago·verify at source

Fixed versions
  • rhacm2/multicluster-operators-channel-rhel9:1787260663
  • rhacm2/multicluster-operators-channel-rhel9:1787259310
  • rhacm2/multicluster-operators-channel-rhel9:1787172840
  • rhacm2/multicluster-operators-channel-rhel9:1787238600
  • rhacm2/multicluster-operators-channel-rhel9:1787242105
  • rhacm2/multicluster-operators-channel-rhel9:1787242099
  • RHSA-2026:60387
  • RHSA-2026:60390
  • RHSA-2026:60388
  • RHSA-2026:60389
  • RHSA-2026:60391
  • RHSA-2026:60386

Official advisory · high-confidence parse· fetched 1 day ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Restrict the creation of `Channel` resources to trusted administrators within Red Hat Advanced Cluster Management. This limits the attack surface by preventing unauthorized tenants from exploiting the confused deputy vulnerability in the `multicloud-operators-channel` component.

Official advisory · high-confidence parse· fetched 1 day ago·verify at source

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