CVE-2026-39961

6.8 MEDIUM 0.4% exploit odds Fix listed Auth & access Server

What it is

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.

At a glance

Exploitability: Can be exploited over the network with an admin-level account. High risk of data exposure.
Exploit odds: 0.4% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-04-09 18:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-26 21:10 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.4% in the next 30 days (EPSS).
Severity: 6.8 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2026-04-09 18:17 UTC
Last modified: 2026-10-26 21:10 UTC
Exploit probability: 0.4% · EPSS, next 30 days
Weakness: CWE-269 · Improper privilege management
Record status: Analyzed

Affected

Aiven Operator < 0.37.0

Attack profile CVSS 3.1 · 6.8

Attack vector: Network
Complexity: Low
Privileges needed: High
User interaction: None
Scope: Changed
Confidentiality: High
Integrity: None
Availability: None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record