Low 3.5Published Oct 6, 2026

CVE-2026-106487Backstage: Unsupported catalog cluster authentication mode in kubernetes backend

Updated under an hour ago (2026-10-19 08:23 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 3.5 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
Weakness (CWE): CWE-441
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Undergoing Analysis
Record last updated: Oct 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

backstage backstage backstage:backstage (from the name)	before 1.54.6	CNA record
@backstage plugin-kubernetes-backend backstage:plugin_kubernetes_backend (from the name)	before 0.21.10	CNA record

References

https://github.com/backstage/backstage/security/advisories/GHSA-h53x-hjx6-25grx-refsource-confirm
https://github.com/backstage/backstage/commit/c14f8be6908f0f719b16356e5492352311e28946x-refsource-misc
https://github.com/backstage/backstage/releases/tag/v1.54.6x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.