{"id":"CVE-2026-39961","aliases":["GHSA-99j8-wv67-4c72","GO-2026-5283"],"url":"https://o3.security/vulnerability/CVE-2026-39961","summary":"Aiven Operator has cross-namespace secret exfiltration via ClickhouseUser connInfoSecretSource","details":"Aiven Operator allows you to provision and manage Aiven Services from your Kubernetes cluster. From 0.31.0 to before 0.37.0, a developer with create permission on ClickhouseUser CRDs in their own namespace can exfiltrate secrets from any other namespace — production database credentials, API keys, service tokens — with a single kubectl apply. The operator reads the victim's secret using its ClusterRole and writes the password into a new secret in the attacker's namespace. The operator acts as a confused deputy: its ServiceAccount has cluster-wide secret read/write (aiven-operator-role ClusterRole), and it trusts user-supplied namespace values in spec.connInfoSecretSource.namespace without validation. No admission webhook enforces this boundary — the ServiceUser webhook returns nil, and no ClickhouseUser webhook exists. This vulnerability is fixed in 0.37.0.","published":"2026-04-09T17:14:07.330Z","modified":"2026-07-31T18:31:38.331995080Z","cvss":{"score":6.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N"},"epss":{"score":0.00395,"percentile":0.32266,"asOf":"2026-08-06"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/aiven/aiven-operator","fixedVersion":"0.37.0"}],"fix":{"url":"https://github.com/aiven/aiven-operator/commit/032c9ba63257fdd2fddfb7f73f71830e371ff182","label":"aiven/aiven-operator@032c9ba"},"references":[{"type":"WEB","url":"https://github.com/aiven/aiven-operator/releases/tag/v0.37.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39961.json"},{"type":"ADVISORY","url":"https://github.com/aiven/aiven-operator/security/advisories/GHSA-99j8-wv67-4c72"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39961"},{"type":"FIX","url":"https://github.com/aiven/aiven-operator/commit/032c9ba63257fdd2fddfb7f73f71830e371ff182"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-31T18:31:38.331995080Z"}}