CVE-2026-106510 Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.yml
Authenticated users can execute arbitrary OS commands on the TechDocs build host by crafting malicious mkdocs.yml files in Backstage.
- 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-2026-106510?
CVE-2026-106510 is a high-severity code injection 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 1.14.6, the @backstage/plugin-techdocs-node package is affected by remote code execution via crafted markdown_extensions in techdocs mkdocs.yml. An authenticated user who can register catalog entities can provide a crafted mkdocs.yml causing arbitrary OS command execution on the TechDocs build host when the docs are built. This issue is fixed in versions 1.14.6 and 1.15.4.
Which versions are affected by CVE-2026-106510?
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-2026-106510?
Upgrade @backstage/plugin-techdocs-node to 1.15.4 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-106510 being exploited?
There is no known exploitation of CVE-2026-106510 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-4488-j8vj-vqqv.