CVE-2026-106560 Backstage: Improper repository path validation in a Scaffolder backend module
Authenticated users can write files outside the intended workspace via improper path validation in the Backstage Confluence-to-Markdown scaffolder module.
- 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-2026-106560?
CVE-2026-106560 is a high-severity path traversal vulnerability in Linuxfoundation Backstage, published on 7 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 0.3.25, the @backstage/plugin-scaffolder-backend-module-confluence-to-markdown package is affected by improper repository path validation in a scaffolder backend module. An authenticated user who can execute an affected template and control its repository file location may cause generated content to be written outside the task workspace, within locations writable by the Backstage backend process. This issue is fixed in version 0.3.25.
Weakness: CWE-22
Which versions are affected by CVE-2026-106560?
2 open source packages ship an affected version, including @backstage/plugin-scaffolder-backend-module-confluence-to-markdown. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
@backstage/plugin-scaffolder-backend-module-confluence-to-markdown npm | All versions | 0.3.25 |
@backstage/plugin-scaffolder-backend-module-confluence-to-markdown npm | All versions | 0.3.25 |
Products include Linuxfoundation Backstage, Linuxfoundation Backstage\/Plugin-Scaffolder-Backend-Module-Confluence-to-Markdown.
How do I fix CVE-2026-106560?
Upgrade @backstage/plugin-scaffolder-backend-module-confluence-to-markdown to 0.3.25 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-106560 being exploited?
There is no known exploitation of CVE-2026-106560 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-2cmg-v53w-8xfp.