{"id":"CVE-2026-55636","state":"PUBLISHED","title":"Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected","description":"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.","publishedAt":"2026-09-15T15:27:44.731Z","updatedAt":"2026-09-15T18:02:29.068Z","severity":{"score":5.7,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["projectcapsule capsule"],"affected":[{"vendor":"projectcapsule","product":"capsule","versions":[{"version":">= 0.13.0, < 0.13.6","status":"affected"}]}],"references":["https://github.com/projectcapsule/capsule/security/advisories/GHSA-gwxr-7h77-7777","https://github.com/projectcapsule/capsule/pull/1966","https://github.com/projectcapsule/capsule/commit/af2f37793e789b2301da8ed8dfb52ab60affebb6","https://github.com/projectcapsule/capsule/releases/tag/v0.13.6"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55636.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55636","state":"PUBLISHED","datePublished":"2026-09-15T15:27:44.731Z","dateUpdated":"2026-09-15T18:02:29.068Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T23:52:12.057Z"},"containers":{"cna":{"title":"Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected","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."}],"affected":[{"vendor":"projectcapsule","product":"capsule","versions":[{"version":">= 0.13.0, < 0.13.6","status":"affected"}]}],"references":[{"url":"https://github.com/projectcapsule/capsule/security/advisories/GHSA-gwxr-7h77-7777","name":"https://github.com/projectcapsule/capsule/security/advisories/GHSA-gwxr-7h77-7777","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/projectcapsule/capsule/pull/1966","name":"https://github.com/projectcapsule/capsule/pull/1966","tags":["x_refsource_MISC"]},{"url":"https://github.com/projectcapsule/capsule/commit/af2f37793e789b2301da8ed8dfb52ab60affebb6","name":"https://github.com/projectcapsule/capsule/commit/af2f37793e789b2301da8ed8dfb52ab60affebb6","tags":["x_refsource_MISC"]},{"url":"https://github.com/projectcapsule/capsule/releases/tag/v0.13.6","name":"https://github.com/projectcapsule/capsule/releases/tag/v0.13.6","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.7,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-15T15:27:44.731Z"},"source":{"advisory":"GHSA-gwxr-7h77-7777","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-15T17:38:16.677370Z","id":"CVE-2026-55636","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-15T18:02:29.068Z"}}]}}}