CVE-2026-10090 — Multicluster-operators-subscription: multicluster-operators-subscription: namespace edit user can deploy cluster-scoped clusterrolebinding and become cluster-admin via application subscription

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.11, Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.13, Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.14…).
2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
3. Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-267

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

Timeline

What happened to this CVE, newest first.

• 2026
• Affected products added · red hat/red hat advanced cluster management for kubernetes 2.11, red hat/red hat advanced cluster management for kuberne
  Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
• SSVC assessment updated
  Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 15, 2026
• CVSS changed · 9.0
  Oct 15, 2026 · NIST National Vulnerability Database
• Source status changed · → Awaiting Analysis
  Oct 15, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 15, 2026 · NIST National Vulnerability Database
• CVE published
  Aug 5, 2026 · redhat

Source activity

Repeated readings are counted rather than listed.

• 1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

• access.redhat.com/errata/RHSA-2026:60387
  vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
• access.redhat.com/errata/RHSA-2026:60390
  vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
• access.redhat.com/errata/RHSA-2026:60389
  vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
• access.redhat.com/errata/RHSA-2026:60388
  vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
• access.redhat.com/errata/RHSA-2026:60386
  vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
• bugzilla.redhat.com/show_bug.cgi
  issue-tracking, x_refsource_REDHAT, NIST National Vulnerability Database
• access.redhat.com/security/cve/CVE-2026-10090
  vdb-entry, x_refsource_REDHAT, NIST National Vulnerability Database
• access.redhat.com/errata/RHSA-2026:60391
  vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• High CVE-2026-89060 Stolostron/multicluster-observability-addon: cross-namespace secret disclosure in multicluster-observability-addon via unvalidated configuration references Sep 11, 2026
• Critical CVE-2026-66786 Submariner: submariner: ipsec.conf stanza injection via remote-supplied cablename and subnets Sep 2, 2026
• High CVE-2026-73137 Multicloud-operators-subscription: multicloud-operators-subscription: cross-namespace secret exfiltration via helmrelease.repo.secretref.namespace Aug 20, 2026
• Critical CVE-2026-67567 Multicloud-operators-subscription: multicloud-operators-subscription: helmrelease chart applied with controller sa without gvk or namespace restriction Aug 20, 2026
• High CVE-2026-66787 Lighthouse: lighthouse: cross-cluster dns spoofing via unvalidated endpointslice ip addresses Aug 20, 2026
• High CVE-2026-66785 Submariner: submariner: missing validation of remote endpoint subnets and clusterid enables cross-cluster traffic hijack Aug 20, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No FIRST EPSS score.
• No fixed version, patch or mitigation documented.
• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-10090 is "Multicluster-operators-subscription: multicluster-operators-subscription: namespace edit user can deploy cluster-scoped clusterrolebinding and become cluster-admin via application subscription", rated Critical. It affects Red Hat Advanced Cluster Management for Kubernetes 2.11 (Red Hat); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.0 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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