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CVE-2026-40868— kyverno apicall servicecall implicit bearer token injection leaks kyverno serviceaccount token

Quick assessment

Affected
kyverno kyverno
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kyverno是Kyverno开源的一个为 Kubernetes 设计的策略引擎。 Kyverno 1.16.4之前版本存在安全漏洞，该漏洞源于apiCall servicecall助手隐式注入授权令牌，可能导致将服务账户令牌发送到攻击者控制的端点。

CVSS 8.1 · High EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1552.004 · Private Keys
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I. Basic Information for CVE-2026-40868

Vulnerability Information
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Vulnerability Title
kyverno apicall servicecall implicit bearer token injection leaks kyverno serviceaccount token
Source: CVE Program / CVE List V5
Vulnerability Description
Kyverno is a policy engine designed for cloud native platform engineering teams. Prior to 1.16.4, kyverno’s apiCall servicecall helper implicitly injects Authorization: Bearer ... using the kyverno controller serviceaccount token when a policy does not explicitly set an Authorization header. Because context.apiCall.service.url is policy-controlled, this can send the kyverno serviceaccount token to an attacker-controlled endpoint (confused deputy). Namespaced policies are blocked from servicecall usage by the namespaced urlPath gate in pkg/engine/apicall/apiCall.go, so this report is scoped to ClusterPolicy and global context usage. This vulnerability is fixed in 1.16.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感信息的不安全存储
Source: CVE Program / CVE List V5
Vulnerability Title
Kyverno 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kyverno是Kyverno开源的一个为 Kubernetes 设计的策略引擎。 Kyverno 1.16.4之前版本存在安全漏洞，该漏洞源于apiCall servicecall助手隐式注入授权令牌，可能导致将服务账户令牌发送到攻击者控制的端点。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kyverno kyverno < 1.16.4 -

II. Public POCs for CVE-2026-40868

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III. Intelligence Information for CVE-2026-40868

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Vendor Advisories for CVE-2026-40868 (1)

IV. Related Vulnerabilities

Same product: kyverno
Same vendor: kyverno
Same weakness: CWE-922

V. Comments for CVE-2026-40868

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