{"id":"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.","aliases":["GHSA-99j8-wv67-4c72","GO-2026-5283"],"modified":"2026-08-12T03:51:35.149808442Z","published":"2026-04-09T17:14:07.330Z","related":["openSUSE-SU-2026:21483-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39961.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-269","CWE-441"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/aiven/aiven-operator","events":[{"introduced":"ee09b203177652dff932e6ef2c8fed4aaaec736d"},{"fixed":"43b74ef7c5b2cc719fa8057c771db0aa7d2fac9e"},{"fixed":"032c9ba63257fdd2fddfb7f73f71830e371ff182"}],"database_specific":{"cpe":"cpe:2.3:a:aiven:aiven_operator:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0.31.0"},{"fixed":"0.37.0"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["v0.36.0","v0.35.0","v0.34.0","v0.33.1","v0.31.0","v0.33.0","v0.32.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39961.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N"}]}