CVE-2026-39961 (GCVE-0-2026-39961)

Vulnerability from cvelistv5 – Published: 2026-04-09 17:14 – Updated: 2026-04-10 14:08
VLAI?
Title
Aiven Operator has cross-namespace secret exfiltration via ClickhouseUser connInfoSecretSource
Summary
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.
Severity ?
6.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
CWE
  • CWE-269 - Improper Privilege Management
  • CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')
Assigner
References
Impacted products
Vendor Product Version
aiven aiven-operator Affected: < 0.37.0
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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