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TI-2026-18364 Aliases CVE-2026-22872GHSA-qjjm-7j9w-pw72

Capsule TenantResource RawItems Cluster-Scoped Resource Creation Vulnerability

Priority HIGH 70CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0068 52nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed capsule (projectcapsule): 0.13.0github.com/projectcapsule/capsule (Go): 0.13.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
projectcapsulecapsulebefore 0.13.00.13.0Patch availableCNA
—github.com/projectcapsule/capsule (Go)before 0.13.00.13.0Patch availableGHSA-qjjm-7j9w-pw72
  • capsule Vendorprojectcapsule Affected before 0.13.0 Fixed in 0.13.0 Patch available CNA
  • github.com/projectcapsule/capsule (Go) Vendor— Affected before 0.13.0 Fixed in 0.13.0 Patch available GHSA-qjjm-7j9w-pw72

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:projectcapsule:capsule:*:*:*:*:*:*:*:*before 0.13.0Vulnerableprojectcapsule
  • cpe:2.3:a:projectcapsule:capsule:*:*:*:*:*:*:*:* Versions before 0.13.0 Vulnerable ·projectcapsule

Remediation

  • Fix · CNA capsule (projectcapsule) Fixed in 0.13.0
  • Fix · GHSA-qjjm-7j9w-pw72 github.com/projectcapsule/capsule (Go) Fixed in 0.13.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-22872
  2. 2026-10-03 Alias added: GHSA-qjjm-7j9w-pw72

References

Exploit 1

Advisory 1

Other 2

  • TI-2024-26614 Capsule tenant owner with "patch namespace" permission can hijack system namespaces CVSS 3.1HIGH 8.8
  • TI-2026-23788 Capsule Namespace Hijacking via subresource CVSS 3.1LOW 3.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences