8.1
High
CVE-2026-106503 Backstage is an open framework for building developer portals
Description
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 products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| backstage 1.51 | 1.51.0-next.0 → < 1.54.6 | 1.54.6 |
| backstage 1.50 | 1.50.0-next.0 → < 1.50.5 | 1.50.5 |
| backstage 1.49 | earliest → < 1.49.6 | 1.49.6 |
| plugin-scaffolder-backend 4.0 | 4.0.0 → < 4.1.0 | 4.0.3 |
| plugin-scaffolder-backend 3.4 | 3.4.0 → < 3.4.1 | 3.4.1 |
| plugin-scaffolder-backend 3.3 | earliest → < 3.3.1 | 3.3.1 |
Other CVEs of backstage
The 69 CVEs of backstage →
CVE-2026-115923
Backstage is an open framework for building developer portals
6.5
Medium
CVE-2026-106495
Backstage is an open framework for building developer portals
4.3
Medium
CVE-2026-106557
Backstage is an open framework for building developer portals
7.7
High
CVE-2026-106563
Backstage is an open framework for building developer portals
5.3
Medium