---
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
vendor: backstage
product: backstage
affected:
  - backstage < 1.54.6
  - plugin-scaffolder-backend < 4.1.0
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T22:17:04.907'
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
tags:
  - nvd
  - cve.org
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.

## Remediation

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