CVE-2026-55636
Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.6, charts/capsule/templates/configuration.yaml configures the validating webhook with namespace/finalize instead of the Kubernetes resource name namespaces/finalize. A user with namespaces/finalize RBAC can send a PUT request to /api/v1/namespaces/{namespace}/finalize, and the singular rule never matches the plural resource, so the validating webhook is not invoked and the user can change the namespace tenant label. matchPolicy: Equivalent does not compensate because it handles API group and version equivalence rather than resource-name errors. This vulnerability is fixed in 0.13.6.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 5.7
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L
- EPSS probability
- 0.28%
- CWE
- CWE-863
- Published
- 2026-09-15
- Last modified
- 2026-09-15
Affected products
- projectcapsule capsule
Weakness type
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