Disclosure summary
### 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.
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-hmp2-4m7g-22cv
Open original source · Updated Oct 07, 2026
Backstage: Scaffolder action input authorization bypass
Source severity: HIGH / 0
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| npm | @backstage/plugin-scaffolder-backend | < 3.3.1 | 3.3.1 |
| npm | @backstage/plugin-scaffolder-backend | >= 3.4.0, < 3.4.1 | 3.4.1 |
| npm | @backstage/plugin-scaffolder-backend | >= 4.0.0, < 4.0.3 | 4.0.3 |
| npm | @backstage/plugin-scaffolder-backend | >= 4.0.4, < 4.1.0 | 4.1.0 |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Reviewed advisory
PUBLISHED 2026-10-07T13:59:08-04:00
MODIFIED 2026-10-07T13:59:09-04:00
INGESTED 2026-10-08T12:05:11-04:00