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Incorrect Authorization

CVE-2026-44882

Low
0/10

Summary

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 issue affects github.com/portainer/portainer versions 2.33.0 prior to 2.33.8.

  • LOW
  • NETWORK
  • HIGH
  • UNCHANGED
  • NONE
  • LOW
  • HIGH
  • NONE

CWE-863 - Incorrect Authorization

Authorization is a security mechanism performed by an application to grant or deny access to the requested resources by verifying the privileges of the user. When an application lacks effective authorization mechanisms, it enables unauthorized users to gain unintended privileges and illegitimate access to resources. Such a vulnerability may result in exposure of sensitive information, denial of service, arbitrary code execution, and complete system takeover.

References

Advisory Timeline

  • Published