projectcapsule up to 0.12.x TenantResource RawItems input validation

Summaryinfo

A vulnerability labeled as problematic has been found in projectcapsule capsule up to 0.12.x. Affected by this issue is some unknown functionality of the component TenantResource RawItems Handler. Executing a manipulation can lead to input validation. This vulnerability is registered as CVE-2026-22872. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in projectcapsule capsule up to 0.12.x. It has been declared as problematic. This vulnerability affects an unknown part of the component TenantResource RawItems Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-22872 since 01/12/2026. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation requires an enhanced level of successful authentication. There are neither technical details nor an exploit publicly available.

Upgrading to version 0.13.0 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• projectcapsule

Name

• capsule

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12

Website

• Product: https://github.com/projectcapsule/capsule/

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