RCE vulnerability affecting v1beta3 templates in @backstage/plugin-scaffolder-backend
The templating library used by the scaffolder backend assumes that templates are trusted which is an undesired property of the scaffolder-backend. This has now been mitigated by sandboxing the template code execution.
Impact
A malicious actor with write access to a registered scaffolder template could manipulate the template in a way that allows for remote code execution on the scaffolder-backend instance. This was only exploitable in the template yaml definition itself and not by user input data.
Patches
This is vulnerability is patched in version 0.15.14 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 | < 0.15.14 | 0.15.14 |
References
- Weakness (CWE)
-- Platform
- npm
- Package
@backstage/plugin-scaffolder-backend- Disclosed
- 01.12.2021
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-2g8g-63j4-9w3r - 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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RCE vulnerability affecting v1beta3 templates in @backstage/plugin-scaffolder-backend this entry
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