CVE-2026-106487
Backstage: Unsupported catalog cluster authentication mode in kubernetes backend
Impact
Backstage is an open framework for building developer portals. Prior to 0.21.10, the @backstage/plugin-kubernetes-backend package is affected by unsupported catalog cluster authentication mode in kubernetes backend. Deployments using catalog cluster discovery may be affected when catalog contributors can create or modify kubernetes-cluster Resource entities. With the required endpoint permissions and pod RBAC, the backend can use its local in-cluster identity, potentially exposing Kubernetes resources readable by that identity. The credential is used only with the local in-cluster API endpoint and is not sent to the catalog-supplied endpoint. This issue is fixed in version 0.21.10.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @backstage/plugin-kubernetes-backend | < 0.21.10 | 0.21.10 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linuxfoundation | Backstage\/Plugin-Kubernetes-Backend | before 0.21.10 |
| Linuxfoundation | Backstage | before 1.54.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-h53x-hjx6-25gr
- https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr
- https://nvd.nist.gov/vuln/detail/CVE-2026-106487
- https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946
- https://github.com/backstage/backstage/releases/tag/v1.54.6