CVE-2026-44882— Portainer: Kubernetes middleware continues after token validation failure, bypassing endpoint authorization

Portainer: Kubernetes middleware continues after token validation failure, bypassing endpoint authorization

Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments. From 2.33.0 to before 2.33., Portainer proxies requests to Kubernetes clusters through a middleware layer (kubeClientMiddleware) that validates the requesting user's token before forwarding traffic to the cluster. When security.RetrieveTokenData returned an error, the middleware wrote an HTTP 403 response but was missing a return statement — execution continued into the handler with a nil tokenData value. The Kubernetes endpoints sit behind Portainer's outer AuthenticatedAccess bouncer, so an attacker requires a valid Portainer session. However, a user whose secondary token validation fails in kubeClientMiddleware — for example a user without permission to access a given Kubernetes endpoint — would have their request forwarded to the cluster anyway, bypassing the authorization check. The same defect was present in both the CE and EE codebases. This vulnerability is fixed in 2.33.8.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

授权机制不正确

Portainer 安全漏洞

Portainer是Portainer开源的一款用于管理Docker环境和Docker主机的轻量级用户管理界面。 Portainer Community Edition 2.33.0版本至2.33.8之前版本存在安全漏洞，该漏洞源于kubeClientMiddleware中间件在安全令牌验证失败时缺少返回语句，导致请求绕过授权检查转发到Kubernetes集群。

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