CVE-2026-55636

{"id": "CVE-2026-55636", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55636", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-15T17:38:16.677370Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.7, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "HIGH", "confidentialityImpact": "LOW"}, "impactScore": 4.7, "exploitabilityScore": 0.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "projectcapsule", "product": "capsule", "versions": [{"status": "affected", "version": ">= 0.13.0, < 0.13.6"}]}]}], "published": "2026-09-15T16:17:14.990", "references": [{"url": "https://github.com/projectcapsule/capsule/commit/af2f37793e789b2301da8ed8dfb52ab60affebb6", "source": "security-advisories@github.com"}, {"url": "https://github.com/projectcapsule/capsule/pull/1966", "source": "security-advisories@github.com"}, {"url": "https://github.com/projectcapsule/capsule/releases/tag/v0.13.6", "source": "security-advisories@github.com"}, {"url": "https://github.com/projectcapsule/capsule/security/advisories/GHSA-gwxr-7h77-7777", "source": "security-advisories@github.com"}], "vulnStatus": "Received", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-863"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-09-15T19:17:22.553", "sourceIdentifier": "security-advisories@github.com"}