GHSA-99j8-wv67-4c72

Aiven Operator has cross-namespace secret exfiltration via ClickhouseUser connInfoSecretSource

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-39961

Packages

Ecosystem	Package	Affected	Fixed in
Go	github.com/aiven/aiven-operator	>= 0.31.0, < 0.37.0	0.37.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact 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. ### Patches This vulnerability is resolved in version 0.37.0. We recommend all users update as soon as possible. ### Credits Credits to Andrés Cruciani for finding and reporting the bug through our [bug bounty program](https://bugcrowd.com/aiven-mbb-og)

References

External links from the advisory. They lead to third-party sites.