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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946 Patch
- https://github.com/backstage/backstage/releases/tag/v1.54.6 Patch, Release Notes
- https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr Mitigation, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 4
- Cpes+2 CPE criteria (now 2)NVD modified 2026-10-22 18:49
- StatusUndergoing Analysis → AnalyzedNVD modified 2026-10-22 18:49
- CVSS3.5 (v3.1, CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N) → 5.0 (v3.1, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N)NVD modified 2026-10-22 18:49
- First seenCVSS 3.5NVD modified 2026-10-09 02:17
Affected (CPE criteria) 2
cpe:2.3:a:linuxfoundation:backstage\/plugin-kubernetes-backend:*:*:*:*:*:node.js:*:*cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*