---
id: CVE-2026-106557
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
  and 1.15.4, the @backstage/plugin-techdocs-node package did not sufficiently
  validate TechDocs Markdown extension configuration. An authenticated user who
  can…
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-22
  - CWE-918
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: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T18:17:16.983'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106557'
references:
  - url: >-
      https://github.com/backstage/backstage/commit/017ace52d9b327ededc6704cf17799c875ae0f29
    label: security-advisories@github.com
  - url: >-
      https://github.com/backstage/backstage/commit/2d9de4ca117a529de4b6ed7dfb7aa507ca7b3f91
    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-f7v3-xhm6-w245
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-f7v3-xhm6-w245'
tags:
  - nvd
  - cve.org
  - ghsa
  - npm
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-07T17:47:07.050445Z'
aliases:
  - GHSA-f7v3-xhm6-w245
ecosystem: npm
ingestedAt: '2026-10-07T16:38:22.231Z'
---

## Overview

Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package did not sufficiently validate TechDocs Markdown extension configuration. An authenticated user who can register or modify documentation sources may cause a TechDocs build to access resources outside the intended documentation boundary, potentially exposing backend-host data or internal network resources. This issue is fixed in versions 1.14.6 and 1.15.4 when pymdown-extensions 10.21.3 or later is also used, normally through mkdocs-techdocs-core 1.7.0 or later.

## Remediation

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

## Package advisory (CVE-2026-106557)

Affected packages:

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

Patched in:

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

Source: https://github.com/advisories/GHSA-f7v3-xhm6-w245