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Fencer Vulns
high 7.7

CVE-2026-89060 json

Stolostron/multicluster-observability-addon: cross-namespace secret disclosure in multicluster-observability-addon via unvalidated configuration references

published 2026-09-11 59 d ago modified 2026-09-21 49 d ago also EUVD-2026-75948

cvss
7.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13 1789126264
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14 1789126262
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15 1789126262
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 1789126267
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 1789126264

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-89060 updated cvss 7.7

stolostron/multicluster-observability-addon: Cross-namespace Secret disclosure in multicluster-observability-addon via unvalidated configuration references

  • Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/acm-multicluster-observability-addon-rhel9 1789126264
    fixed: vendor fix “Disable MCOA log-forwarding and tracing capabilities that use ClusterLogForwarder or OpenTelemetryCollector resources.” RHSA-2026:67540
  • Red Hat Advanced Cluster Management for Kubernetes 2.14 rhacm2/acm-multicluster-observability-addon-rhel9 1789126262
    fixed: vendor fix “Disable MCOA log-forwarding and tracing capabilities that use ClusterLogForwarder or OpenTelemetryCollector resources.” RHSA-2026:67539
  • Red Hat Advanced Cluster Management for Kubernetes 2.15 rhacm2/acm-multicluster-observability-addon-rhel9 1789126262
    fixed: vendor fix “Disable MCOA log-forwarding and tracing capabilities that use ClusterLogForwarder or OpenTelemetryCollector resources.” RHSA-2026:67541
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/acm-multicluster-observability-addon-rhel9 1789126267
    fixed: vendor fix “Disable MCOA log-forwarding and tracing capabilities that use ClusterLogForwarder or OpenTelemetryCollector resources.” RHSA-2026:67542
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/acm-multicluster-observability-addon-rhel9 1789126264
    fixed: vendor fix “Disable MCOA log-forwarding and tracing capabilities that use ClusterLogForwarder or OpenTelemetryCollector resources.” RHSA-2026:67543
  • Red Hat Advanced Cluster Management for Kubernetes 2.13 rhacm2/thanos-rhel9 1789136147, rhacm2/acm-cli-rhel9 1788560311, rhacm2/console-rhel9 1788972841, rhacm2/prometheus-rhel9 1788952534, rhacm2/acm-grafana-rhel9 1788954486, rhacm2/acm-search-v2-rhel9 1788987824, +37 more Red Hat Advanced Cluster Management for Kubernetes 2.14 rhacm2/thanos-rhel9 1789135282, rhacm2/acm-cli-rhel9 1788562158, rhacm2/console-rhel9 1788563615, rhacm2/prometheus-rhel9 1788941108, rhacm2/acm-grafana-rhel9 1788956632, rhacm2/acm-search-v2-rhel9 1788986409, +37 more Red Hat Advanced Cluster Management for Kubernetes 2.15 rhacm2/thanos-rhel9 1788942355, rhacm2/acm-cli-rhel9 1788894643, rhacm2/console-rhel9 1788564023, rhacm2/prometheus-rhel9 1788943695, rhacm2/acm-grafana-rhel9 1788955233, rhacm2/acm-search-v2-rhel9 1788985829, +39 more Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/thanos-rhel9 1788946739, rhacm2/acm-cli-rhel9 1788565829, rhacm2/console-rhel9 1788880980, rhacm2/prometheus-rhel9 1788941293, rhacm2/acm-grafana-rhel9 1788944338, rhacm2/acm-search-v2-rhel9 1788986751, +40 more Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/thanos-rhel9 1789141821, rhacm2/acm-cli-rhel9 1788568151, rhacm2/console-rhel9 1788883472, rhacm2/prometheus-rhel9 1788942592, rhacm2/acm-grafana-rhel9 1788967047, rhacm2/acm-search-v2-rhel9 1788985384, +39 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
59 d ago

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Affected products

  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17

Classification

Weakness
  • CWE-551 Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.