CVE-2026-106487

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.

CVSS 3.1

5.0CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 17% of CVEs (scores of 2026-10-25)

CWE

CWE-441

Published

2026-10-06

Modified

2026-10-22

Record from

the NVD, synced 2026-10-23

Affected

• linuxfoundation:backstage
• linuxfoundation:backstage\/plugin-kubernetes-backend

Packages (OSV)

References

• https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946
• https://github.com/backstage/backstage/releases/tag/v1.54.6
• https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25gr

Check your stackJSON