CVE-2026-106509
CVE-2026-106509 · Backstage: Improper validation of MkDocs theme configuration in TechDocs
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in mkdocs.yml that cause arbitrary code execution during the documentation build process. This issue is fixed in versions 1.14.6 and 1.15.4.
CVSS 7.7 · High · EPSS 0.5% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
backstage
- Versions
- < 1.50.5: Affected
- >= 1.51.0-next.0, < 1.54.6: Affected
No fix published
plugin-techdocs-node
- Versions
- < 1.14.6: Affected
- >= 1.15.0, < 1.15.4: Affected
No fix published
@backstage/plugin-techdocs-node npm
- Affected ranges
- SEMVER: < 1.15.4
Update to 1.15.4
Original sources
- https://github.com/backstage/backstage/security/advisories/GHSA-8w7q-29mw-gf5c
- https://github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbb
- https://github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9d
- https://github.com/backstage/backstage/releases/tag/v1.50.5
- https://github.com/backstage/backstage/releases/tag/v1.54.6
- https://nvd.nist.gov/vuln/detail/CVE-2026-106509