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Vulnerability Details :

CVE-2026-39961

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-09 Apr, 2026 | 17:14
Updated At-10 Apr, 2026 | 14:08
Rejected At-
Credits

Aiven Operator has cross-namespace secret exfiltration via ClickhouseUser connInfoSecretSource

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:09 Apr, 2026 | 17:14
Updated At:10 Apr, 2026 | 14:08
Rejected At:
▼CVE Numbering Authority (CNA)
Aiven Operator has cross-namespace secret exfiltration via ClickhouseUser connInfoSecretSource

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.

Affected Products
Vendor
Aivenaiven
Product
aiven-operator
Versions
Affected
  • < 0.37.0
Problem Types
TypeCWE IDDescription
CWECWE-269CWE-269: Improper Privilege Management
CWECWE-441CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')
Type: CWE
CWE ID: CWE-269
Description: CWE-269: Improper Privilege Management
Type: CWE
CWE ID: CWE-441
Description: CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')
Metrics
VersionBase scoreBase severityVector
3.16.8MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Version: 3.1
Base score: 6.8
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/aiven/aiven-operator/security/advisories/GHSA-99j8-wv67-4c72
x_refsource_CONFIRM
https://github.com/aiven/aiven-operator/commit/032c9ba63257fdd2fddfb7f73f71830e371ff182
x_refsource_MISC
https://github.com/aiven/aiven-operator/releases/tag/v0.37.0
x_refsource_MISC
Hyperlink: https://github.com/aiven/aiven-operator/security/advisories/GHSA-99j8-wv67-4c72
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/aiven/aiven-operator/commit/032c9ba63257fdd2fddfb7f73f71830e371ff182
Resource:
x_refsource_MISC
Hyperlink: https://github.com/aiven/aiven-operator/releases/tag/v0.37.0
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:09 Apr, 2026 | 18:17
Updated At:13 May, 2026 | 16:06

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.16.8MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Primary3.14.9MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Type: Secondary
Version: 3.1
Base score: 6.8
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Type: Primary
Version: 3.1
Base score: 4.9
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CPE Matches

Aiven
aiven
>>aiven_operator>>Versions from 0.31.0(inclusive) to 0.37.0(exclusive)
cpe:2.3:a:aiven:aiven_operator:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-269Primarysecurity-advisories@github.com
CWE-441Primarysecurity-advisories@github.com
CWE ID: CWE-269
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-441
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/aiven/aiven-operator/commit/032c9ba63257fdd2fddfb7f73f71830e371ff182security-advisories@github.com
Patch
https://github.com/aiven/aiven-operator/releases/tag/v0.37.0security-advisories@github.com
Product
Release Notes
https://github.com/aiven/aiven-operator/security/advisories/GHSA-99j8-wv67-4c72security-advisories@github.com
Vendor Advisory
Hyperlink: https://github.com/aiven/aiven-operator/commit/032c9ba63257fdd2fddfb7f73f71830e371ff182
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/aiven/aiven-operator/releases/tag/v0.37.0
Source: security-advisories@github.com
Resource:
Product
Release Notes
Hyperlink: https://github.com/aiven/aiven-operator/security/advisories/GHSA-99j8-wv67-4c72
Source: security-advisories@github.com
Resource:
Vendor Advisory

Change History

0
Information is not available yet

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