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Advisory severityHigh7.1Red Hat Linux

High [CVE-2026-66800] CleanupAll triggers unguarded cluster-wide mass-delete via operator ServiceAccount

This high-severity Red Hat Linux advisory covers CVE-2026-66800 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-2026-66800 Source published Source updated

VulniPulse record published Record updated

CVE-2026-66800
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

Server-side request forgery (ssrf) in Azure Data Factory allows an unauthorized attacker to disclose information over a network. A flaw was found in cluster-backup-operator.

A namespace administrator with privileges in the open-cluster-management-backup namespace can exploit a feature in the Restore Custom Resource (CR). By setting the cleanupBeforeRestore field to CleanupAll, an attacker can trigger an unguarded, cluster-wide deletion of all Red Hat Advanced Cluster Management (ACM) and Hive-labelled Secrets and ConfigMaps.

This leads to a denial of service across the entire hub cluster by removing critical resources. This vulnerability is rated as Important.

A namespace administrator within the `open-cluster-management-backup` namespace in Red Hat Advanced Cluster Management for Kubernetes can initiate a cluster-wide denial of service. Red Hat severity: Important — CVSS 7.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H).

Weakness: CWE-862. Red Hat fixing advisory: RHSA-2026:60387, RHSA-2026:60390, RHSA-2026:60388, RHSA-2026:60389, RHSA-2026:60391, RHSA-2026:60386.

Affected products named by the advisory: 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; and 2 more.

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 4 hours ago·verify at source

Fixed versions
  • rhacm2/cluster-backup-rhel9-operator:1787684668
  • rhacm2/cluster-backup-rhel9-operator:1787259060
  • rhacm2/cluster-backup-rhel9-operator:1787183178
  • rhacm2/cluster-backup-rhel9-operator:1787238500
  • rhacm2/cluster-backup-rhel9-operator:1787183176
  • rhacm2/cluster-backup-rhel9-operator:1787227576
  • RHSA-2026:60387
  • RHSA-2026:60390
  • RHSA-2026:60388
  • RHSA-2026:60389
  • RHSA-2026:60391
  • RHSA-2026:60386

Official advisory · high-confidence parse· fetched 4 hours 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 4 hours ago·verify at source

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