{"id":"CVE-2026-39961","sourceIdentifier":"security-advisories@github.com","published":"2026-04-09T18:17:02.053","lastModified":"2026-06-17T10:42:49.110","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"aiven","product":"aiven-operator","versions":[{"version":"< 0.37.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N","baseScore":6.8,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":2.3,"impactScore":4.0},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N","baseScore":4.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":1.2,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-10T14:08:13.060841Z","id":"CVE-2026-39961","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-269"},{"lang":"en","value":"CWE-441"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:aiven:aiven_operator:*:*:*:*:*:*:*:*","versionStartIncluding":"0.31.0","versionEndExcluding":"0.37.0","matchCriteriaId":"C5AF06D3-28FA-443E-9DFC-D2212C1434E6"}]}]}],"references":[{"url":"https://github.com/aiven/aiven-operator/commit/032c9ba63257fdd2fddfb7f73f71830e371ff182","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/aiven/aiven-operator/releases/tag/v0.37.0","source":"security-advisories@github.com","tags":["Product","Release Notes"]},{"url":"https://github.com/aiven/aiven-operator/security/advisories/GHSA-99j8-wv67-4c72","source":"security-advisories@github.com","tags":["Vendor Advisory"]}]}