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CVE-2026-30963— Capsule Namespace Hijacking via subresource

Quick assessment

Affected
projectcapsule capsule
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Capsule是Project Capsule开源的一个 Kubernetes 的多租户和基于策略的框架。 Capsule 0.13.0之前版本存在输入验证错误漏洞，该漏洞源于Webhook未定义namespace/finalize和namespace/status子资源拦截规则，可能导致命名空间劫持。

CVSS 3.9 · Low EPSS 0.25% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
projectcapsule capsule < 0.13.0 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Capsule 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Capsule是Project Capsule开源的一个 Kubernetes 的多租户和基于策略的框架。 Capsule 0.13.0之前版本存在输入验证错误漏洞，该漏洞源于Webhook未定义namespace/finalize和namespace/status子资源拦截规则，可能导致命名空间劫持。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
projectcapsule capsule < 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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