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.

Score

CVSS 3.1 7.7 High

Status

Awaiting Analysis - secalert@redhat.com

Published

2026-09-11

Last modified

2026-09-21

Weaknesses

CWE-551

Affected products

• Acm (Redhat)

References

• https://access.redhat.com/errata/RHSA-2026:67539
• https://access.redhat.com/errata/RHSA-2026:67540
• https://access.redhat.com/errata/RHSA-2026:67541
• https://access.redhat.com/errata/RHSA-2026:67542
• https://access.redhat.com/errata/RHSA-2026:67543
• https://access.redhat.com/security/cve/CVE-2026-89060
• https://bugzilla.redhat.com/show_bug.cgi?id=2531596
• https://github.com/stolostron/multicluster-observability-addon/pull/644