CVE-2026-22872: Capsule TenantResource RawItems Cluster-Scoped Resource Creation Vulnerability

May 28, 2026 (updated June 9, 2026)

The Capsule Controller runs with cluster-admin privileges. Although the TenantResource RawItems processing logic forcibly sets the namespace, this is ineffective for cluster-scoped resources. Tenant administrators can leverage the Controller’s elevated privileges to create cluster-scoped resources (such as ClusterRole and ValidatingWebhookConfiguration) that they cannot create directly, achieving cross-tenant privilege escalation and cluster-level attacks.

References

github.com/advisories/GHSA-qjjm-7j9w-pw72
github.com/projectcapsule/capsule/releases/tag/v0.13.0
github.com/projectcapsule/capsule/security/advisories/GHSA-qjjm-7j9w-pw72
nvd.nist.gov/vuln/detail/CVE-2026-22872

Code Behaviors & Features

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