Vulnerability Description
Capsule is a multi-tenancy and policy-based framework for Kubernetes. 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. Prior to version 0.13.0, 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. The attack vector has a few limiting factors. This attack requires Tenant Owner privileges and requires Capsule Controller running with cluster-admin privileges (default configuration). Additionally, some clusters may have additional admission controllers blocking malicious resources. Version 0.13.0 patches this issue.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Projectcapsule | Capsule | < 0.13.0 |
Related Weaknesses (CWE)
References
- https://github.com/projectcapsule/capsule/releases/tag/v0.13.0ProductRelease Notes
- https://github.com/projectcapsule/capsule/security/advisories/GHSA-qjjm-7j9w-pw7ExploitVendor Advisory
- https://github.com/projectcapsule/capsule/security/advisories/GHSA-qjjm-7j9w-pw7ExploitVendor Advisory
FAQ
What is CVE-2026-22872?
CVE-2026-22872 is a vulnerability with a CVSS score of 9.1 (CRITICAL). Capsule is a multi-tenancy and policy-based framework for Kubernetes. The Capsule Controller runs with cluster-admin privileges. Although the TenantResource RawItems processing logic forcibly sets the...
How severe is CVE-2026-22872?
CVE-2026-22872 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-22872?
Check the references section above for vendor advisories and patch information. Affected products include: Projectcapsule Capsule.