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CVE-2026-30963— Capsule Namespace Hijacking via subresource

CVSS 3.9 · Low

Affected Version Matrix 1

VendorProductVersion RangeStatus
projectcapsulecapsule< 0.13.0affected
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I. Basic Information for CVE-2026-30963

Vulnerability Information
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Vulnerability Title
Capsule Namespace Hijacking via subresource
Source: NVD (National Vulnerability Database)
Vulnerability Description
Capsule is a multi-tenancy and policy-based framework for Kubernetes. To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. However, in Kubernetes, the namespace/finalize and namespace/status subresource APIs can also modify various fields of a namespace, including the metadata field. Prior to version 0.13.0, the webhook does not define interception rules for these subresources. As a result, if a tenant administrator has permission to modify namespace/status or namespace/finalize, they can successfully perform namespace hijacking. Version 0.13.0 fixes the issue. Another mitigation is to add two subresources (namespaces and snamespaces/status with namespace/finalize within it) to the resources list in the ValidatingWebhookConfiguration rules.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
projectcapsulecapsule < 0.13.0 -

II. Public POCs for CVE-2026-30963

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III. Intelligence Information for CVE-2026-30963

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Vendor Advisories for CVE-2026-30963 (1)

Vendor Pages for CVE-2026-30963 (1)

IV. Related Vulnerabilities

Same product: capsule
Same vendor: projectcapsule
Same weakness: CWE-20

V. Comments for CVE-2026-30963

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