Backstage has a Possible Symlink Path Traversal in Scaffolder Actions
Impact
Multiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to:
- Read arbitrary files via the
debug:logaction by creating a symlink pointing to sensitive files (e.g.,/etc/passwd, configuration files, secrets) - Delete arbitrary files via the
fs:deleteaction by creating symlinks pointing outside the workspace - Write files outside the workspace via archive extraction (tar/zip) containing malicious symlinks
This affects any Backstage deployment where users can create or execute Scaffolder templates.
Patches
This vulnerability is fixed in the following package versions:
@backstage/backend-defaultsversion 0.12.2, 0.13.2, 0.14.1, 0.15.0@backstage/plugin-scaffolder-backendversion 2.2.2, 3.0.2, 3.1.1@backstage/plugin-scaffolder-nodeversion 0.11.2, 0.12.3
Users should upgrade to these versions or later.
Workarounds
- Follow the recommendation in the Backstage Threat Model to limit access to creating and updating templates
- Restrict who can create and execute Scaffolder templates using the permissions framework
- Audit existing templates for symlink usage
- Run Backstage in a containerized environment with limited filesystem access
References
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | @backstage/backend-defaults | < 0.12.2, >= 0.13.0, < 0.13.2, >= 0.14.0, < 0.14.1 | 0.12.2, 0.13.2, 0.14.1 |
| Paquete de npm | @backstage/plugin-scaffolder-backend | < 2.2.2, >= 3.0.0, < 3.0.2, >= 3.1.0, < 3.1.1 | 2.2.2, 3.0.2, 3.1.1 |
| Paquete de npm | @backstage/plugin-scaffolder-node | < 0.11.2, >= 0.12.0, < 0.12.3 | 0.11.2, 0.12.3 |
Referencias
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L- Debilidad (CWE)
CWE-22, CWE-59- Plataforma
- npm
- Paquete
@backstage/backend-defaults, @backstage/plugin-scaffolder-backend, @backstage/plugin-scaffolder-node- Publicada
- 21.01.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-rq6q-wr2q-7pgp - CC BY 4.0
Historial de vulnerabilidades: @backstage/plugin-scaffolder-backend
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 17
- Primera → última
- 10.2021 10.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 1
- Alta 6
- Media 8
- Baja 2
Divulgaciones por año
- 2021: 3
- 2022: 0
- 2023: 1
- 2024: 0
- 2025: 1
- 2026: 12
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Backstage has a Possible Symlink Path Traversal in Scaffolder Actions esta entrada
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