---
id: CVE-2026-106499
title: Backstage is an open framework for building developer portals
summary: >-
  Backstage is an open framework for building developer portals. Prior to 4.1.0,
  the @backstage/plugin-scaffolder-backend package could expose secret-derived
  values in Scaffolder task logs. Deployments that configure sensitive
  scaffolder.d…
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-532
  - CWE-538
vendor: linuxfoundation
product: backstage/plugin-scaffolder-backend
affected:
  - backstage/plugin-scaffolder-backend < 4.1.0
  - backstage < 1.54.6
patched:
  - backstage/plugin-scaffolder-backend 4.1.0
  - backstage 1.54.6
published: '2026-10-06'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:16:07.970'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106499'
references:
  - url: >-
      https://github.com/backstage/backstage/commit/dc30fae2d96cb1606d36cc40b242f9b9e539bd70
    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-mfvq-x7vr-rgqg
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106499'
  - url: 'https://github.com/advisories/GHSA-mfvq-x7vr-rgqg'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-106499.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-106499'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2547214'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-106499'
tags:
  - nvd
  - ghsa
  - npm
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.0027
epssPercentile: 0.19042
aliases:
  - GHSA-mfvq-x7vr-rgqg
ecosystem: npm
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-07T17:45:56.549598Z'
ingestedAt: '2026-10-06T22:23:15.966Z'
---

## Overview

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.defaultEnvironment.secrets and allow an attacker to create or modify Scaffolder templates are affected. A template author could cause secret-derived values used during template iteration to be persisted and exposed to users who can access the resulting task logs. This issue is fixed in version 4.1.0.

## Affected

- `backstage/plugin-scaffolder-backend < 4.1.0`
- `backstage < 1.54.6`

## Remediation

Upgrade past the affected range:

- `backstage/plugin-scaffolder-backend 4.1.0`
- `backstage 1.54.6`

## Package advisory (CVE-2026-106499)

Affected packages:

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

Patched in:

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

Source: https://github.com/advisories/GHSA-mfvq-x7vr-rgqg

## Vendor advisories

- **Red Hat VEX** · Moderate · 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-2026-106499.json)