CVE-2026-106507 Backstage: TechDocs arbitrary file read via mkdocs snippets

Medium 5.3 Published 6 Oct 2026 Updated 7 Oct 2026

An authenticated user can read arbitrary files outside the documentation boundary via unsafe path resolution in TechDocs.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-106507?

CVE-2026-106507 is a medium-severity path traversal vulnerability in Linuxfoundation Backstage, published on 6 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Backstage is an open framework for building developer portals. Prior to 1.15.4, the @backstage/plugin-techdocs-node package is affected by techdocs arbitrary file read via mkdocs snippets. Unsafe path resolution in TechDocs source tree handling allows an authenticated user who can register documentation sources to include content from outside the intended documentation boundary. Depending on deployment, this may expose files readable by the build process. This issue is fixed in version 1.15.4.

Weakness: CWE-61, CWE-59

Which versions are affected by CVE-2026-106507?

It affects 2 products.

Products include Linuxfoundation Backstage, Linuxfoundation Backstage Plugin-Techdocs-Node.

How do I fix CVE-2026-106507?

No fix has been published for CVE-2026-106507 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-106507 being exploited?

There is no known exploitation of CVE-2026-106507 in the wild and no public exploit code.

All Linuxfoundation Backstage vulnerabilities

Sources

Also known as GHSA-vmqh-7cj9-mvcj.