---
id: CVE-2026-106561
title: Backstage is an open framework for building developer portals
summary: >-
  Backstage is an open framework for building developer portals. Prior to
  0.21.9, the @backstage/plugin-kubernetes-backend package is affected by
  sensitive information disclosure in kubernetes resource queries. An
  authenticated user holdin…
severity: medium
cvss: 5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N'
cwe:
  - CWE-200
  - CWE-863
vendor: backstage
product: backstage
affected:
  - backstage < 1.54.2
  - plugin-kubernetes-backend < 0.21.9
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T17:16:51.197'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106561'
references:
  - url: >-
      https://github.com/backstage/backstage/commit/388926ae5734bc20bd6a1520d02896be834f6527
    label: security-advisories@github.com
  - url: 'https://github.com/backstage/backstage/releases/tag/v1.54.2'
    label: security-advisories@github.com
  - url: >-
      https://github.com/backstage/backstage/security/advisories/GHSA-p795-mqf2-36mf
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106561'
  - url: 'https://github.com/advisories/GHSA-p795-mqf2-36mf'
tags:
  - nvd
  - cve.org
  - ghsa
  - npm
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-07T15:26:59.491887Z'
ingestedAt: '2026-10-07T15:36:04.053Z'
aliases:
  - GHSA-p795-mqf2-36mf
ecosystem: npm
patched:
  - '@backstage/plugin-kubernetes-backend 0.21.9'
---

## Overview

Backstage is an open framework for building developer portals. Prior to 0.21.9, the @backstage/plugin-kubernetes-backend package is affected by sensitive information disclosure in kubernetes resource queries. An authenticated user holding the standard Kubernetes resource read permission could retrieve sensitive values that the Kubernetes plugin is designed to mask, potentially exposing credentials and other confidential material held in the connected clusters. Exposure is limited to resources that the Backstage service account is permitted to read and that match the targeted catalog entity's namespace and label selector. Deployments whose cluster credentials do not grant read access to these resources are unaffected. This issue is fixed in version 0.21.9.

## Remediation

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

## Package advisory (CVE-2026-106561)

Affected packages:

- `@backstage/plugin-kubernetes-backend < 0.21.9`

Patched in:

- `@backstage/plugin-kubernetes-backend 0.21.9`

Source: https://github.com/advisories/GHSA-p795-mqf2-36mf