CVE-2026-39961

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Source
https://cve.org/CVERecord?id=CVE-2026-39961
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39961.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-39961
Aliases
Downstream
Related
Published
2026-04-09T17:14:07Z
Modified
2026-08-12T03:51:35Z
Severity
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N CVSS Calculator
Summary
Aiven Operator has cross-namespace secret exfiltration via ClickhouseUser connInfoSecretSource
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-269",
        "CWE-441"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39961.json"
}
References

Affected packages

Git / github.com/aiven/aiven-operator

Affected ranges

Type
GIT
Repo
https://github.com/aiven/aiven-operator
Events
Introduced
ee09b203177652dff932e6ef2c8fed4aaaec736d
Fixed
43b74ef7c5b2cc719fa8057c771db0aa7d2fac9e
Fixed
032c9ba63257fdd2fddfb7f73f71830e371ff182
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:aiven:aiven_operator:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0.31.0"
        },
        {
            "fixed": "0.37.0"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.31.0
v0.32.0
v0.33.0
v0.33.1
v0.34.0
v0.35.0
v0.36.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39961.json"