high7.6
CVE-2026-106492
Backstage: Improper preservation of access restrictions during service credential delegation
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @backstage/backend-defaults | < 0.17.8 | 0.17.8 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linuxfoundation | Backstage\/Backend-Defaults | before 0.16.1 from 0.17.0 before 0.17.8 |
| Linuxfoundation | Backstage | before 1.49.6 from 1.50.0 before 1.54.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-cq7v-rfgc-5c7v
- https://github.com/backstage/backstage/security/advisories/GHSA-cq7v-rfgc-5c7v
- https://nvd.nist.gov/vuln/detail/CVE-2026-106492
- https://github.com/backstage/backstage/commit/40346245c53e1bf26dee56601e95c5c4ab9cc124
- https://github.com/backstage/backstage/commit/bc80ffdafbc92ff7b8c72347eace13cb8688fd33
- https://github.com/backstage/backstage/releases/tag/v1.49.6
- https://github.com/backstage/backstage/releases/tag/v1.54.6