Backstage: Inconsistent credential enforcement for overlapping proxy routes
Impact
An operator can configure overlapping proxy paths with different credential requirements. When a parent path permits unauthenticated access and a nested path requires credentials, the parent exemption can also cover requests handled by the nested proxy. An unauthenticated caller may therefore reach the nested upstream through Backstage, including with static upstream credentials configured for that proxy.
Exploitation requires this specific overlapping route configuration. The resulting confidentiality and integrity impact depends on the capabilities exposed by the nested upstream.
Patches
Upgrade @backstage/plugin-proxy-backend to version 0.6.18 or later. The fixed package is available in Backstage v1.55.0.
Workarounds
- Avoid nesting a credential-protected proxy path below a path configured with
dangerously-allow-unauthenticated. - Apply the same credential requirement to overlapping proxy paths.
- Restrict direct network access to the Backstage backend until the patched package is deployed.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | @backstage/plugin-proxy-backend | >= 0.5.0, < 0.6.18 | 0.6.18 |
Referencias
- https://github.com/backstage/backstage/security/advisories/GHSA-472h-9c5j-prrr
- https://nvd.nist.gov/vuln/detail/CVE-2026-106456
- https://github.com/backstage/backstage/commit/9df92923ac32558bb80edeceafd8de780c44e218
- https://github.com/backstage/backstage
- https://github.com/backstage/backstage/releases/tag/v1.55.0
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N- Debilidad (CWE)
CWE-863- Plataforma
- npm
- Paquete
@backstage/plugin-proxy-backend- Publicada
- 07.10.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-472h-9c5j-prrr - CC BY 4.0
Historial de vulnerabilidades: @backstage/plugin-proxy-backend
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 2
- Primera → última
- 10.2026 10.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Media 2
Divulgaciones por año
- 2026: 2
-
Backstage: Inconsistent credential enforcement for overlapping proxy routes esta entrada
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