CVE-2026-39961 (GCVE-0-2026-39961)
Vulnerability from cvelistv5 – Published: 2026-04-09 17:14 – Updated: 2026-04-10 14:08
VLAI
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-10 14:08 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/aiven/aiven-operator/security/… | x_refsource_CONFIRM |
| https://github.com/aiven/aiven-operator/commit/03… | x_refsource_MISC |
| https://github.com/aiven/aiven-operator/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| aiven | aiven-operator |
Affected:
< 0.37.0
|
guessed |
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| Author | Source | Type | Date | Other |
|---|
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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