CVE-2026-39961
Aiven Operator has cross-namespace secret exfiltration via ClickhouseUser connInfoSecretSource
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.
| CWE | CWE-269 CWE-441 |
| Vendor | aiven |
| Product | aiven-operator |
| Published | Apr 9, 2026 |
| Last Updated | Apr 10, 2026 |
Get instant alerts for aiven aiven-operator
Be the first to know when new medium vulnerabilities affecting aiven aiven-operator are published — delivered to Slack, Telegram or Discord.
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N