# CVE-2026-106508: Backstage TechDocs local publisher path traversal

Source: https://junglewise.ai/threats/cve-2026-106508-backstage-is-an-open-framework-for-building-developer-portals  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-06. Updated: 2026-10-06  
License: CC BY 4.0 with a link back

CVE-2026-106508 · Severity: medium · CVSS 5.3 · Published 2026-10-06

Backstage is an open framework for building developer portals that teams use to centralize documentation and tooling. In versions before 1.15.4, when configured to serve documentation locally rather than via cloud storage, the platform could be tricked into exposing files outside the documentation directory to authenticated users. This affects only local deployments; cloud-based storage options (S3, GCS, Azure) are not impacted.

Technologies: [Backstage @Backstage/Plugin-Techdocs-Node](https://junglewise.ai/threats/technologies/plugin-techdocs-node), [@backstage/plugin-techdocs-node (npm)](https://junglewise.ai/threats/technologies/npm-backstage-plugin-techdocs-node). Vendors: [Backstage](https://junglewise.ai/threats/vendors/backstage), [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-106508 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-106508 being exploited in the wild.

**How severe is CVE-2026-106508?** Medium severity, with a CVSS score of 5.3, published 6 October 2026.

**Which products and versions are affected?** Backstage @Backstage/Plugin-Techdocs-Node prior to 1.15.4; @backstage/plugin-techdocs-node (npm) < 1.15.4, SEMVER:introduced=0,fixed=1.15.4.

**Is there a fix for CVE-2026-106508?** Yes. @backstage/plugin-techdocs-node (npm): upgrade to 1.15.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-106508 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-106508?** Check whether you run Backstage @Backstage/Plugin-Techdocs-Node or @backstage/plugin-techdocs-node (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- @backstage/plugin-techdocs-node (npm): upgrade to 1.15.4 or later

  ```sh
  npm install @backstage/plugin-techdocs-node@1.15.4
  ```


## Technical details

The @backstage/plugin-techdocs-node package suffers from a path traversal vulnerability in the local TechDocs publisher that allows the documentation serving endpoint to follow filesystem references outside the intended documentation tree. This requires authentication and specific preconditions that do not arise through normal MkDocs operation. The vulnerability is fixed by validating file paths in the local publisher logic.

## Affected products

- Backstage @backstage/plugin-techdocs-node prior to 1.15.4

## Identifiers

- CVE-2026-106508
- GHSA-cm77-ch27-6w6v

## Timeline

- 2026-10-06: disclosed

## References

- [https://github.com/backstage/backstage/commit/6aecb26f337ffec1d4e67ce903cf1e39b6082ec4](https://github.com/backstage/backstage/commit/6aecb26f337ffec1d4e67ce903cf1e39b6082ec4)
- [https://github.com/backstage/backstage/releases/tag/v1.54.6](https://github.com/backstage/backstage/releases/tag/v1.54.6)

## Related threats

- [Backstage TechDocs remote code execution via mkdocs.yml](https://junglewise.ai/threats/cve-2026-106510-backstage-remote-code-execution-via-crafted-markdown-extensions)
- [Backstage plugin-techdocs-node code execution in MkDocs configuration](https://junglewise.ai/threats/cve-2026-106558-backstage-improper-validation-of-techdocs-mkdocs-configuration)
- [Backstage improper input validation in TechDocs Markdown extension](https://junglewise.ai/threats/cve-2026-106557-backstage-has-improper-input-validation-in-techdocs-markdown)
- [Backstage plugin-techdocs-node code execution in mkdocs configuration](https://junglewise.ai/threats/cve-2026-106509-backstage-is-an-open-framework-for-building-developer-portals)
- [Backstage plugin-techdocs-node MkDocs config sanitizer bypass](https://junglewise.ai/threats/cve-2026-106505-backstage-is-an-open-framework-for-building-developer-portals)