Disclosure summary
### Impact 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. ### Patches Patched in `@backstage/plugin-techdocs-node` version `1.15.4` ### Workarounds - Configure TechDocs with `techdocs.generator.runIn: 'docker'` instead of `'local'` to provide container isolation, though this does not fully mitigate the risk. - Restrict write access to repositories registered in the Backstage catalog to trusted users.
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
GitHub Reviewed Security Advisories · GHSA-8w7q-29mw-gf5c
Open original source · Updated Oct 07, 2026
Backstage: Improper validation of MkDocs theme configuration in TechDocs
Source severity: HIGH / 0
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| npm | @backstage/plugin-techdocs-node | < 1.15.4 | 1.15.4 |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Reviewed advisory
PUBLISHED 2026-10-07T12:23:30-04:00
MODIFIED 2026-10-07T12:23:31-04:00
INGESTED 2026-10-08T12:05:11-04:00