---
id: CVE-2026-25153
title: >-
  Backstage is an open framework for building developer portals, and
  @backstage/plugin-techdocs-node provides common node.js functionalities for
  TechDocs
summary: >-
  Backstage is an open framework for building developer portals, and
  @backstage/plugin-techdocs-node provides common node.js functionalities for
  TechDocs. In versions of @backstage/plugin-techdocs-node prior to 1.13.11 and
  1.14.1, when Tec…
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-94
vendor: linuxfoundation
product: backstage
affected:
  - backstage < 1.13.11
  - 'backstage >= 1.14.0, < 1.14.1'
patched:
  - backstage 1.14.1
published: '2026-01-30'
updated: '2026-06-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-25153'
references:
  - url: >-
      https://github.com/backstage/backstage/security/advisories/GHSA-6jr7-99pf-8vgf
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:6174'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:6802'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-25153'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2435576'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25153.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00575
epssPercentile: 0.45036
ingestedAt: '2026-07-03T18:53:52.142Z'
---

## Overview

Backstage is an open framework for building developer portals, and @backstage/plugin-techdocs-node provides common node.js functionalities for TechDocs. In versions of @backstage/plugin-techdocs-node prior to 1.13.11 and 1.14.1, when TechDocs is configured with `runIn: local`, a malicious actor who can submit or modify a repository's `mkdocs.yml` file can execute arbitrary Python code on the TechDocs build server via MkDocs hooks configuration. @backstage/plugin-techdocs-node versions 1.13.11 and 1.14.1 contain a fix. The fix introduces an allowlist of supported MkDocs configuration keys. Unsupported configuration keys (including `hooks`) are now removed from `mkdocs.yml` before running the generator, with a warning logged to indicate which keys were removed. Users of `@techdocs/cli` should also upgrade to the latest version, which includes the fixed `@backstage/plugin-techdocs-node` dependency. Some workarounds are available. Configure TechDocs with `runIn: docker` instead of `runIn: local` to provide container isolation, though it does not fully mitigate the risk. Limit who can modify `mkdocs.yml` files in repositories that TechDocs processes; only allow trusted contributors. Implement PR review requirements for changes to `mkdocs.yml` files to detect malicious `hooks` configurations before they are merged. Use MkDocs < 1.4.0 (e.g., 1.3.1) which does not support hooks. Note: This may limit access to newer MkDocs features. Building documentation in CI/CD pipelines using `@techdocs/cli` does not mitigate this vulnerability, as the CLI uses the same vulnerable `@backstage/plugin-techdocs-node` package.

## Affected

- `backstage < 1.13.11`
- `backstage >= 1.14.0, < 1.14.1`

## Remediation

Upgrade past the affected range:

- `backstage 1.14.1`