CVE-2026-106492
Description
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.
How to fix
- linuxfoundation backstage1.49.6, 1.54.6 or later
- linuxfoundation backstage\/backend-defaults0.16.1, 0.17.8 or later
- @backstage/backend-defaults0.17.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linuxfoundation backstage | v < 1.49.6, 1.50.0 ≤ v < 1.54.6 | 1.49.6, 1.54.6 |
| linuxfoundation backstage\/backend-defaults | v < 0.16.1, 0.17.0 ≤ v < 0.17.8 | 0.16.1, 0.17.8 |
| @backstage/backend-defaultsnpm | v < 0.17.8 | 0.17.8 |
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Attack Surface Management
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