{"id":"CVE-2023-46254","aliases":["GHSA-6758-979h-249x"],"url":"https://o3.security/vulnerability/CVE-2023-46254","summary":"Service accounts can see namespaces of other tenants in capsule-proxy","details":"capsule-proxy is a reverse proxy for Capsule kubernetes multi-tenancy framework. A bug in the RoleBinding reflector used by `capsule-proxy` gives ServiceAccount tenant owners the right to list Namespaces of other tenants backed by the same owner kind and name. For example consider two tenants `solar` and `wind`. Tenant `solar`, owned by a ServiceAccount named `tenant-owner` in the Namespace `solar`. Tenant `wind`, owned by a ServiceAccount named `tenant-owner` in the Namespace `wind`. The Tenant owner `solar` would be able to list the namespaces of the Tenant `wind` and vice-versa, although this is not correct. The bug introduces an exfiltration vulnerability since allows the listing of Namespace resources of other Tenants, although just in some specific conditions: 1. `capsule-proxy` runs with the `--disable-caching=false` (default value: `false`) and 2. Tenant owners are ServiceAccount, with the same resource name, but in different Namespaces. This vulnerability doesn't allow any privilege escalation on the outer tenant Namespace-scoped resources, since the Kubernetes RBAC is enforcing this. This issue has been addressed in version 0.4.5. Users are advised to upgrade. There are no known workarounds for this vulnerability.","published":"2023-11-06T18:34:13.555Z","modified":"2026-07-15T01:48:56.933412898Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/projectcapsule/capsule","fixedVersion":"0.4.5"},{"ecosystem":"Go","name":"github.com/projectcapsule/capsule-proxy","fixedVersion":"0.4.5"}],"fix":{"url":"https://github.com/projectcapsule/capsule-proxy/commit/615202f7b02eaec7681336bd63daed1f39ae00c5","label":"projectcapsule/capsule-proxy@615202f"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/46xxx/CVE-2023-46254.json"},{"type":"ADVISORY","url":"https://github.com/projectcapsule/capsule-proxy/security/advisories/GHSA-6758-979h-249x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-46254"},{"type":"FIX","url":"https://github.com/projectcapsule/capsule-proxy/commit/615202f7b02eaec7681336bd63daed1f39ae00c5"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:48:56.933412898Z"}}