Vulnerability Details CVE-2026-39961
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 3.1%
CVSS Severity
CVSS v3 Score 6.8
References
Products affected by CVE-2026-39961
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cpe:2.3:a:aiven:aiven_operator:0.31.0
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cpe:2.3:a:aiven:aiven_operator:0.31.1
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cpe:2.3:a:aiven:aiven_operator:0.32.0
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cpe:2.3:a:aiven:aiven_operator:0.33.0
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cpe:2.3:a:aiven:aiven_operator:0.33.1
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cpe:2.3:a:aiven:aiven_operator:0.34.0
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cpe:2.3:a:aiven:aiven_operator:0.35.0
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cpe:2.3:a:aiven:aiven_operator:0.36.0