---
id: CVE-2026-106509
title: Backstage is an open framework for building developer portals
summary: >-
  Backstage is an open framework for building developer portals. Prior to
  1.14.6, the @backstage/plugin-techdocs-node package is affected by improper
  validation of mkdocs theme configuration in techdocs. When TechDocs is
  configured to buil…
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L'
cwe:
  - CWE-94
  - CWE-1336
vendor: backstage
product: backstage
affected:
  - backstage < 1.50.5
  - 'backstage >= 1.51.0-next.0, < 1.54.6'
  - plugin-techdocs-node < 1.14.6
  - 'plugin-techdocs-node >= 1.15.0, < 1.15.4'
patched:
  - '@backstage/plugin-techdocs-node 1.15.4'
published: '2026-10-06'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T19:17:33.047'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106509'
references:
  - url: >-
      https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb
    label: security-advisories@github.com
  - url: >-
      https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9d
    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-8w7q-29mw-gf5c
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106509'
  - url: 'https://github.com/advisories/GHSA-8w7q-29mw-gf5c'
tags:
  - nvd
  - cve.org
  - ghsa
  - npm
aliases:
  - GHSA-8w7q-29mw-gf5c
ecosystem: npm
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-07T18:01:39.138438Z'
ingestedAt: '2026-10-06T22:23:15.969Z'
---

## Overview

Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in mkdocs.yml that cause arbitrary code execution during the documentation build process. This issue is fixed in versions 1.14.6 and 1.15.4.

## Remediation

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

## Package advisory (CVE-2026-106509)

Affected packages:

- `@backstage/plugin-techdocs-node < 1.15.4`

Patched in:

- `@backstage/plugin-techdocs-node 1.15.4`

Source: https://github.com/advisories/GHSA-8w7q-29mw-gf5c