---
id: CVE-2026-106492
title: Backstage is an open framework for building developer portals
summary: >-
  Backstage is an open framework for building developer portals. Prior to 0.16.1
  and 0.17.8, the @backstage/backend-defaults package is affected by improper
  preservation of access restrictions during service credential delegation. An
  exter…
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L'
cwe:
  - CWE-269
  - CWE-863
  - CWE-281
vendor: backstage
product: backstage
affected:
  - backstage < 1.49.6
  - 'backstage >= 1.50.0-next.0, < 1.54.6'
  - backend-defaults < 0.16.1
  - 'backend-defaults >= 0.17.0, < 0.17.8'
patched:
  - '@backstage/backend-defaults 0.17.8'
published: '2026-10-06'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T02:17:00.467'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106492'
references:
  - url: >-
      https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124
    label: security-advisories@github.com
  - url: >-
      https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33
    label: security-advisories@github.com
  - url: 'https://github.com/backstage/backstage/releases/tag/v1.49.6'
    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-cq7v-rfgc-5c7v
    label: security-advisories@github.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106492.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-106492'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2547199'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-106492'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106492'
  - url: 'https://github.com/advisories/GHSA-cq7v-rfgc-5c7v'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - ghsa
  - npm
epss: 0.00208
epssPercentile: 0.10815
aliases:
  - GHSA-cq7v-rfgc-5c7v
ecosystem: npm
ingestedAt: '2026-10-06T21:20:28.985Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-09T01:50:58.091263Z'
---

## Overview

Backstage is an open framework for building developer portals. Prior to 0.16.1 and 0.17.8, the @backstage/backend-defaults package is affected by improper preservation of access restrictions during service credential delegation. An external service credential configured with access restrictions (e.g., read-only) could bypass those restrictions by routing requests through plugin delegation paths. This could allow a restricted service to perform operations beyond its intended scope, including write operations on plugins it was restricted to read-only access for. This issue is fixed in versions 0.16.1 and 0.17.8.

## Remediation

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

## Package advisory (CVE-2026-106492)

Affected packages:

- `@backstage/backend-defaults < 0.17.8`

Patched in:

- `@backstage/backend-defaults 0.17.8`

Source: https://github.com/advisories/GHSA-cq7v-rfgc-5c7v

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Developer Hub, Self-service automation portal 2 · no fix planned: Red Hat Developer Hub, Self-service automation portal 2 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106492.json)