High · published October 7, 2026
Backstage is an open framework for building developer portals. Prior to 0.16.1 and 0.17.8, the @backstage/backend-defaults package is affected by improper preservation of access restrictions during service credential delegation. An external service credential configured with access restrictions (e.g., read-only) could bypass those restrictions by routing requests through plugin delegation paths. This could allow a restricted service to perform operations beyond its intended scope, including write operations on plugins it was restricted to read-only access for. This issue is fixed in versions 0.16.1 and 0.17.8.
| Product | Versions | Fixed in |
|---|---|---|
| linuxfoundation/backstage\/backend-defaults | < 0.16.1 | 0.16.1 |
| linuxfoundation/backstage\/backend-defaults | ≥ 0.17.0, < 0.17.8 | 0.17.8 |
| linuxfoundation/backstage | < 1.49.6 | 1.49.6 |
| linuxfoundation/backstage | ≥ 1.50.0, < 1.54.6 | 1.54.6 |