CVE-2026-30963
3.9 · LOWOverview
CVE-2026-30963 is a low-severity vulnerability affecting projectcapsule capsule. It was published on June 1, 2026 and has a CVSS 3.1 base score of 3.9 (LOW).
This vulnerability has a CVSS 3.1 base score of 3.9, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from projectcapsule. Update capsule to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| projectcapsule | capsule | >= 0, < 0.13.0 | Affected |
Frequently Asked Questions
What is CVE-2026-30963?
CVE-2026-30963 is a low-severity vulnerability affecting projectcapsule capsule. It was published on June 1, 2026 and has a CVSS 3.1 base score of 3.9 (LOW).
How severe is CVE-2026-30963?
This vulnerability has a CVSS 3.1 base score of 3.9, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-30963?
Check the references section for vendor advisories and patches from projectcapsule. Update capsule to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-30963?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-30963 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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