CVE-2026-106503
CVE-2026-106503 · Backstage: Scaffolder action input authorization bypass
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.1 · High · EPSS 0.4% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
backstage
- Versions
- < 1.49.6: Affected
- >= 1.50.0-next.0, < 1.50.5: Affected
- >= 1.51.0-next.0, < 1.54.6: Affected
No fix published
plugin-scaffolder-backend
- Versions
- < 3.3.1: Affected
- >= 3.4.0, < 3.4.1: Affected
- >= 4.0.0, < 4.0.3: Affected
- >= 4.0.4, < 4.1.0: Affected
No fix published
@backstage/plugin-scaffolder-backend npm
- Affected ranges
- SEMVER: < 3.3.1
Update to 3.3.1
@backstage/plugin-scaffolder-backend npm
- Affected ranges
- SEMVER: ≥ 3.4.0, < 3.4.1
Update to 3.4.1
@backstage/plugin-scaffolder-backend npm
- Affected ranges
- SEMVER: ≥ 4.0.0, < 4.0.3
Update to 4.0.3
@backstage/plugin-scaffolder-backend npm
- Affected ranges
- SEMVER: ≥ 4.0.4, < 4.1.0
Update to 4.1.0
Original sources
- https://github.com/backstage/backstage/security/advisories/GHSA-hmp2-4m7g-22cv
- 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
- https://nvd.nist.gov/vuln/detail/CVE-2026-106503