Backstage: Scaffolder action input authorization bypass
Impact
An authenticated user with access to affected Scaffolder templates could bypass configured action restrictions. Depending on integration credentials, this could grant unauthorized access to repositories and related source-control resources.
Patches
Patched in @backstage/plugin-scaffolder-backend version 4.1.0
Workarounds
- Restrict affected Scaffolder actions to trusted users and configure source-control integrations with least-privilege credentials.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @backstage/plugin-scaffolder-backend | < 3.3.1, >= 3.4.0, < 3.4.1, >= 4.0.0, < 4.0.3, >= 4.0.4, < 4.1.0 | 3.3.1, 3.4.1, 4.0.3, 4.1.0 |
References
- https://github.com/backstage/backstage/security/advisories/GHSA-hmp2-4m7g-22cv
- https://nvd.nist.gov/vuln/detail/CVE-2026-106503
- https://github.com/backstage/backstage/commit/11c1384c0649b8ab26391c6a4e4f34b80ab0d188
- https://github.com/backstage/backstage/commit/a91ed72d540e80b62a73b39bb1563ff5018d52d1
- https://github.com/backstage/backstage/commit/e307e4f487103d815e484291b3fda778ab9983bf
- https://github.com/backstage/backstage
- https://github.com/backstage/backstage/releases/tag/v1.49.6
- https://github.com/backstage/backstage/releases/tag/v1.50.5
- https://github.com/backstage/backstage/releases/tag/v1.54.6
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N- Weakness (CWE)
CWE-178, CWE-284- Platform
- npm
- Package
@backstage/plugin-scaffolder-backend- Disclosed
- 07.10.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-hmp2-4m7g-22cv - 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
-
Backstage: Scaffolder action input authorization bypass this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.