CVE-2026-40868
kyverno apicall servicecall implicit bearer token injection leaks kyverno serviceaccount token
- State
- Published
- Severity
- 8.1 High
- Published
- Apr 21, 2026
- Updated
- Apr 22, 2026
- Reserved
- Apr 15, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N | GitHub_M |
Weaknesses
- CWE-922 Insecure Storage of Sensitive Information
Affected Products
| Product | Versions |
|---|---|
kyvernokyverno |
|
References
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