High [CVE-2026-66799] Restore.spec.namespaceMapping pass-through enables cross-namespace Secret/ConfigMap placement
This high-severity Red Hat Linux advisory covers CVE-2026-66799 affecting Red Hat Advanced Cluster Management for Kubernetes 2.
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Summary
A flaw was found in the cluster-backup-operator. A privileged user with administrative access to a specific namespace could exploit a vulnerability in the backup restoration process.
This flaw allows them to redirect sensitive information, such as cloud provider credentials and access tokens, from backup operations into other namespaces, including those they control. This could lead to unauthorized access to critical system resources and the disclosure of confidential data.
This is an Important vulnerability in Red Hat Advanced Cluster Management for Kubernetes. This allows for a cross-namespace write of credential material, potentially leading to unauthorized access to cloud provider credentials, pull secrets, and ManagedServiceAccount tokens.
Red Hat severity: Important — CVSS 7.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N). Weakness: CWE-863.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected product named by the advisory: Red Hat Advanced Cluster Management for Kubernetes 2.
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 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- To mitigate this issue, restrict administrative access to the `open-cluster-management-backup` namespace. Only trusted administrators should have permissions to create or modify `Restore` Custom Resources within this namespace, as this action is required to exploit the vulnerability.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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