{"cve":"CVE-2026-30963","nvd":{"published":"2026-06-01T19:16:22.780","modified":"2026-07-22T07:10:00.107","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N","score":2.7},"cwes":["CWE-20"],"references":["https://github.com/projectcapsule/capsule/releases/tag/v0.13.0","https://github.com/projectcapsule/capsule/security/advisories/GHSA-2ww6-hf35-mfjm","https://github.com/projectcapsule/capsule/security/advisories/GHSA-2ww6-hf35-mfjm"],"products":["projectcapsule:capsule"],"source":"nvd","synced_at":"2026-10-19T22:37:48.043517290+00:00"},"epss":{"cve":"CVE-2026-30963","score":0.00219,"percentile":0.12378,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2ww6-hf35-mfjm","url":"https://osv.dev/vulnerability/GHSA-2ww6-hf35-mfjm","summary":"Capsule Namespace Hijacking via subresource","modified":"2026-06-17T00:26:27.251512345Z","packages":[{"ecosystem":"Go","name":"github.com/projectcapsule/capsule","purl":"pkg:golang/github.com/projectcapsule/capsule","ranges":["<0.13.0"],"fixed":["0.13.0"]}]},{"id":"GO-2026-5043","url":"https://osv.dev/vulnerability/GO-2026-5043","summary":"Capsule Namespace Hijacking via subresource in github.com/projectcapsule/capsule","modified":"2026-06-17T00:15:12.917706851Z","packages":[{"ecosystem":"Go","name":"github.com/projectcapsule/capsule","purl":"pkg:golang/github.com/projectcapsule/capsule","ranges":["<0.13.0"],"fixed":["0.13.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}