Namespace Hijacking Vulnerability in Capsule Framework for Kubernetes
CVE-2026-30963

3.9LOW

Key Information:

Vendor

Projectcapsule

Status
Capsule
Vendor
CVE Published:
1 June 2026

What is CVE-2026-30963?

Capsule is a multi-tenancy and policy-based framework for Kubernetes that aims to provide robust namespace management. A vulnerability exists in versions prior to 0.13.0 due to the webhook failing to define interception rules for the namespace/finalize and namespace/status subresources. This oversight allows tenant administrators with appropriate permissions to bypass security measures, thus enabling namespace hijacking. Mitigations include upgrading to version 0.13.0 or adjusting the ValidatingWebhookConfiguration to include these subresources.

Affected Version(s)

capsule < 0.13.0

References

https://github.com/projectcapsule/capsule/security/adviso...
x_refsource_CONFIRM
https://github.com/projectcapsule/capsule/releases/tag/v0...
x_refsource_MISC

CVSS V3.1

Score:
3.9
Severity:
LOW
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
High
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.