high8.1
CVE-2026-106503
Backstage is an open framework for building developer portals.
Impact
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by scaffolder action input authorization bypass. 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. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @backstage/plugin-scaffolder-backend | < 3.3.1 | 3.3.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linuxfoundation | Backstage\/Plugin-Scaffolder-Backend | before 3.3.1 from 3.4.0 before 3.4.1 from 4.0.0 before 4.0.3 from 4.0.4 before 4.1.0 |
| Linuxfoundation | Backstage | before 1.49.6 from 1.50.0 before 1.50.5 from 1.51.0 before 1.54.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-hmp2-4m7g-22cv
- 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/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