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

What is CVE-2026-22872?

CVE-2026-22872 is a medium-severity vulnerability in projectcapsule capsule, published on 1 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official 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.

Weakness: CWE-863, CWE-20

Which versions are affected by CVE-2026-22872?

3 open source packages ship an affected version, including github.com/projectcapsule/capsule. It affects 1 product.

Products include Projectcapsule Capsule.

How do I fix CVE-2026-22872?

Upgrade github.com/projectcapsule/capsule to 0.13.0 or later.

Is CVE-2026-22872 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22872 exists.

Other vulnerabilities in projectcapsule capsule

• CVE-2024-39690 Capsule tenant owner with "patch namespace" permission can hijack system namespaces High 8.5
• CVE-2026-30963 Capsule Namespace Hijacking via subresource Low 3.9

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-qjjm-7j9w-pw72, GO-2026-5584.