High severity · published Sep 11, 2026
CVE-2026-89060
Stolostron/multicluster-observability-addon: cross-namespace secret disclosure in multicluster-observability-addon via unvalidated configuration references
7.7
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Advanced Cluster Management for Kubernetes 2.13 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Advanced Cluster Management for Kubernetes 2.14 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Advanced Cluster Management for Kubernetes 2.15 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Advanced Cluster Management for Kubernetes 2.16 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Advanced Cluster Management for Kubernetes 2.17 · Red Hat
All versions, or not specified · source: vendor
Affected product
RH
Red Hat Advanced Cluster Management for Kubernetes 2.13
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89060
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-89060
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
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