CVE-2026-89060
Stolostron/multicluster-observability-addon: cross-namespace secret disclosure in multicluster-observability-addon via unvalidated configuration references
CVSS Score
7.7
EPSS Score
0.2%
EPSS Percentile
14th
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.
| CWE | CWE-551 |
| Published | Sep 11, 2026 |
| Last Updated | Sep 21, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
Red Hat / Red Hat Advanced Cluster Management for Kubernetes 2.13
All versions affected Red Hat / Red Hat Advanced Cluster Management for Kubernetes 2.14
All versions affected Red Hat / Red Hat Advanced Cluster Management for Kubernetes 2.15
All versions affected Red Hat / Red Hat Advanced Cluster Management for Kubernetes 2.16
All versions affected Red Hat / Red Hat Advanced Cluster Management for Kubernetes 2.17
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:67539 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:67540 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:67541 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:67542 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:67543 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-89060 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2531596 github.com: https://github.com/stolostron/multicluster-observability-addon/pull/644