Vulnerability in Red Hat Advanced Cluster Management For Kubernetes 2
CVE-2026-89060
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (40.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-89060 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- github.com/stolostron/multicluster-observability-addon/pull/644
- access.redhat.com/errata/RHSA-2026:67539 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:67540 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:67541 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:67542 (vendor-advisory)
- access.redhat.com/errata/RHSA-2026:67543 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-89060?
- CVE-2026-89060 is a high-severity vulnerability in Red Hat Advanced Cluster Management For Kubernetes 2, classified under CWE-551. CVSS score: 7.7/10. Published 2026-09-11.
- How severe is CVE-2026-89060?
- High severity. CVSS v3 base score is 7.7 out of 10.