Path Traversal in @backstage/plugin-scaffolder-backend
Impact
A malicious actor could read sensitive files from the environment where Scaffolder tasks are run. The attack is executed by crafting a custom Scaffolder template with a publish:github:pull-request action using a particular source path. When the template is executed the sensitive files would be included in the published pull request.
This vulnerability is mitigated by the fact that an attacker would need access to create and register templates in the Backstage catalog, and that the attack is very visible given that the exfiltration happens via a pull request.
Patches
The vulnerability is patched in the 0.15.9 release of @backstage/plugin-scaffolder-backend.
For more information
If you have any questions or comments about this advisory:
- Open an issue in the Backstage repository
- Visit our chat, linked to in Backstage README
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @backstage/plugin-scaffolder-backend | >= 0.9.4, < 0.15.9 | 0.15.9 |
References
- https://github.com/backstage/backstage/security/advisories/GHSA-pvv8-8fx9-h673
- https://nvd.nist.gov/vuln/detail/CVE-2021-41151
- https://github.com/backstage/backstage/commit/6968962c920508eae19a4c1c200fa2c8980a4006
- https://github.com/backstage/backstage
- https://github.com/backstage/backstage/releases/tag/release-2021-10-16
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N- Weakness (CWE)
CWE-22- Platform
- npm
- Package
@backstage/plugin-scaffolder-backend- Disclosed
- 19.10.2021
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-pvv8-8fx9-h673 - CC BY 4.0
Vulnerability history: @backstage/plugin-scaffolder-backend
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
- 17
- First → latest
- 10.2021 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 6
- Medium 8
- Low 2
Disclosures per year
- 2021: 3
- 2022: 0
- 2023: 1
- 2024: 0
- 2025: 1
- 2026: 12
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Path Traversal in @backstage/plugin-scaffolder-backend this entry
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