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Vulnerability · Published Sep 11, 2026 · Assigned by redhat

CVE-2026-89060Stolostron/multicluster-observability-addon: cross-namespace secret disclosure in multicluster-observability-addon via unvalidated configuration references

High 7.7

In plain English

A high-severity security flaw in multicluster-observability-addon. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities).

Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.5%top 58.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

VendorProductVersions
multicluster-observability-addon 0 – before *
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references

Weakness: CWE-551 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References