Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.yml
Impact
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.
Patches
Patched in @backstage/plugin-techdocs-node, version 1.15.4.
Workarounds
If you cannot upgrade immediately:
- Switch to
techdocs.builder: externalto isolate TechDocs builds in a container. - Restrict who can register catalog entities with TechDocs annotations.
- Audit existing catalog entities for suspicious
markdown_extensionsvalues in theirmkdocs.ymlfiles.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @backstage/plugin-techdocs-node | < 1.15.4 | 1.15.4 |
References
- https://github.com/backstage/backstage/security/advisories/GHSA-4488-j8vj-vqqv
- https://nvd.nist.gov/vuln/detail/CVE-2026-106510
- https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb
- https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9d
- https://github.com/backstage/backstage
- https://github.com/backstage/backstage/releases/tag/v1.50.5
- https://github.com/backstage/backstage/releases/tag/v1.54.6
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L- Weakness (CWE)
CWE-183, CWE-470- Platform
- npm
- Package
@backstage/plugin-techdocs-node- Disclosed
- 07.10.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-4488-j8vj-vqqv - CC BY 4.0
Vulnerability history: @backstage/plugin-techdocs-node
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 11
- First → latest
- 06.2022 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 8
- Medium 3
Disclosures per year
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 10
-
Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.yml this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.