---
id: CVE-2026-106500
title: Backstage is an open framework for building developer portals
summary: >-
  Backstage is an open framework for building developer portals. Prior to 3.3.1,
  3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is
  affected by improper task state validation in scaffolder backend. An
  authenticated…
severity: high
cvss: 8.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-59
  - CWE-362
  - CWE-367
vendor: backstage
product: backstage
affected:
  - backstage < 1.49.6
  - 'backstage >= 1.50.0-next.0, < 1.50.5'
  - 'backstage >= 1.51.0-next.0, < 1.54.6'
  - plugin-scaffolder-backend < 3.3.1
  - 'plugin-scaffolder-backend >= 3.4.0, < 3.4.1'
  - 'plugin-scaffolder-backend >= 4.0.0, < 4.0.3'
  - 'plugin-scaffolder-backend >= 4.0.4, < 4.1.0'
published: '2026-10-06'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T16:17:39.567'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106500'
references:
  - url: >-
      https://github.com/backstage/backstage/commit/0d24f1b8701f3dde6cd597f81997c1ea873a43ae
    label: security-advisories@github.com
  - url: >-
      https://github.com/backstage/backstage/commit/56be299dd3ef6706e13e76ea2f8a9b0dd0b6413d
    label: security-advisories@github.com
  - url: >-
      https://github.com/backstage/backstage/commit/9e86c95a1a3ddfd54db03731cd8678aa63495175
    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/v1.50.5'
    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-xvgh-hmx8-9xxf
    label: security-advisories@github.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106500.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-106500'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2547216'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-106500'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106500'
  - url: 'https://github.com/advisories/GHSA-xvgh-hmx8-9xxf'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - ghsa
  - npm
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-07T15:47:41.478403Z'
scores:
  nvd: 8.5
  vendor: 7.1
  ghsa: 8.5
ingestedAt: '2026-10-06T22:23:15.966Z'
aliases:
  - GHSA-xvgh-hmx8-9xxf
ecosystem: npm
patched:
  - '@backstage/plugin-scaffolder-backend 4.1.0'
---

## Overview

Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper task state validation in scaffolder backend. An authenticated user with permission to create and access Scaffolder tasks may, under specific timing and deployment conditions, affect files accessible to the Backstage backend. If backend application files are writable, the confidentiality, integrity, and availability of the backend may be compromised. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.

## Remediation

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

## 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 2026-10-07 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106500.json)

## Package advisory (CVE-2026-106500)

Affected packages:

- `@backstage/plugin-scaffolder-backend < 4.1.0`

Patched in:

- `@backstage/plugin-scaffolder-backend 4.1.0`

Source: https://github.com/advisories/GHSA-xvgh-hmx8-9xxf