CVE-2026-89060
High
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.
SeverityHigh
CVSS7.7
Exploit probability41. percentile0.5%
ProductMulticluster-observability-addon
PublishedSep 11, 2026
First seenSep 11, 2026
Weakness typeCWE-551CWE-551
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| multicluster-observability-addon | 0 | — |
| acm 2.13 | No range specified | — |
| acm 2.14 | No range specified | — |
| acm 2.15 | No range specified | — |
| acm 2.16 | No range specified | — |
| acm 2.17 | No range specified | — |
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