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.

CVSS v3 6.8 MEDIUM

6.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.3 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/aiven/aiven-operator/commit/032c9ba63257fdd2fddfb7f73f71830e371ff182	Patch
https://github.com/aiven/aiven-operator/releases/tag/v0.37.0	Product Release Notes
https://github.com/aiven/aiven-operator/security/advisories/GHSA-99j8-wv67-4c72	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:aiven:aiven_operator:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-04-09 18:17

Updated : 2026-06-17 10:42

NVD link : CVE-2026-39961

Mitre link : CVE-2026-39961

CVE.ORG link : CVE-2026-39961

JSON object : View

Products Affected

aiven

aiven_operator

CWE

CWE-269

Improper Privilege Management

CWE-441

Unintended Proxy or Intermediary ('Confused Deputy')

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