---
id: CVE-2026-106487
title: Backstage is an open framework for building developer portals
summary: >-
  Backstage is an open framework for building developer portals. Prior to
  0.21.10, the @backstage/plugin-kubernetes-backend package is affected by
  unsupported catalog cluster authentication mode in kubernetes backend.
  Deployments using cat…
severity: low
cvss: 3.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N'
cwe:
  - CWE-441
vendor: backstage
product: backstage
affected:
  - backstage < 1.54.6
  - plugin-kubernetes-backend < 0.21.10
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T21:17:17.477'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106487'
references:
  - url: >-
      https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946
    label: security-advisories@github.com
  - url: 'https://github.com/backstage/backstage/releases/tag/v1.54.6'
    label: security-advisories@github.com
  - url: >-
      https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T21:20:28.983Z'
---

## Overview

Backstage is an open framework for building developer portals. Prior to 0.21.10, the @backstage/plugin-kubernetes-backend package is affected by unsupported catalog cluster authentication mode in kubernetes backend. Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources readable by that identity. The credential is used only with the local in-cluster API endpoint and is not sent to the catalog-supplied endpoint. This issue is fixed in version 0.21.10.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.