Unintended Proxy or Intermediary ('Confused Deputy') Affecting @backstage/plugin-kubernetes-backend package, versions <0.21.10
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published11 Oct 2026
- disclosed7 Oct 2026
- creditUnknown
Introduced: 7 Oct 2026
NewCVE-2026-106487 (opens in a new tab)How to fix?
Upgrade @backstage/plugin-kubernetes-backend to version 0.21.10 or higher.
Overview
@backstage/plugin-kubernetes-backend is an A Backstage backend plugin that integrates towards Kubernetes
Affected versions of this package are vulnerable to Unintended Proxy or Intermediary ('Confused Deputy') via CatalogClusterLocator in plugins/kubernetes-backend/src/cluster-locator/CatalogClusterLocator.ts, where a cluster entity annotated with the serviceAccount auth provider is silently accepted rather than rejected. Instead of throwing an error, the locator previously only logged a warning and returned undefined, allowing a catalog-defined cluster with an unsupported authentication provider to pass through validation. An authenticated attacker who can create or modify catalog entities can supply a serviceAccount-annotated Kubernetes cluster resource to influence cluster authentication handling in unintended ways, potentially leaking cluster configuration details.