CVE-2026-106508 Backstage: Potential file exposure through local TechDocs publisher
Authenticated users can expose host files via path traversal in the local TechDocs publisher, requiring specific non-default configuration.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-106508?
CVE-2026-106508 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 potential file exposure through local techdocs publisher. When using the local TechDocs publisher (techdocs.publisher.type: 'local'), it was possible for the documentation serving endpoint to follow filesystem references outside the intended documentation tree, potentially exposing host files to authenticated users. This is mitigated by the fact that exploration requires preconditions that do not arise through normal MkDocs operation. Cloud-based publishers (S3, GCS, Azure Blob Storage) are not affected. This issue is fixed in version 1.15.4.
Which versions are affected by CVE-2026-106508?
2 open source packages ship an affected version, including @backstage/plugin-techdocs-node. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
@backstage/plugin-techdocs-node npm | All versions | 1.15.4 |
@backstage/plugin-techdocs-node npm | All versions | 1.15.4 |
Products include Linuxfoundation Backstage, Linuxfoundation Backstage Plugin-Techdocs-Node.
How do I fix CVE-2026-106508?
Upgrade @backstage/plugin-techdocs-node to 1.15.4 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-106508 being exploited?
There is no known exploitation of CVE-2026-106508 in the wild and no public exploit code.
Other vulnerabilities in Linuxfoundation Backstage
- CVE-2026-106501 Backstage: Sensitive information exposure in Scaffolder
- CVE-2026-106558 Backstage: Improper validation of TechDocs MkDocs configuration
- CVE-2026-88064 Backstage: Improper input validation in TechDocs MkDocs configuration
- CVE-2026-106459 Backstage: Improper input validation in Sentry scaffolder actions
- CVE-2026-106486 Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions
Sources
Also known as GHSA-cm77-ch27-6w6v.