High [CVE-2026-89060] stolostron/multicluster-observability-addon: Cross-namespace Secret disclosure in multicluster-observability-addon via unvalidated configuration references
This high-severity Red Hat Linux advisory covers CVE-2026-89060 affecting Red Hat Advanced Cluster Management for Kubernetes 2.
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Summary
A cross-namespace authorization flaw in multicluster-observability-addon allows a user with permission to modify a managed cluster’s ManagedClusterAddOn configuration to reference ClusterLogForwarder or OpenTelemetryCollector resources outside the permitted namespace.
If those resources reference Secrets, the add-on may copy the referenced Secrets to the attacker-controlled managed cluster. 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-551. Affected Red Hat products: Red Hat Advanced Cluster Management for Kubernetes 2.
Red Hat does not currently list a fixing RHSA for this CVE.
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 hour 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 1 hour ago·verify at source
Mitigation checklist
- Disable MCOA log-forwarding and tracing capabilities that use ClusterLogForwarder or OpenTelemetryCollector resources.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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