Backstage has a sensitive information disclosure in Kubernetes resource queries
Impact
An authenticated user holding the standard Kubernetes resource read permission could retrieve sensitive values that the Kubernetes plugin is designed to mask, potentially exposing credentials and other confidential material held in the connected clusters. Exposure is limited to resources that the Backstage service account is permitted to read and that match the targeted catalog entity's namespace and label selector. Deployments whose cluster credentials do not grant read access to these resources are unaffected.
Patches
Fixed in @backstage/plugin-kubernetes-backend version 0.21.9
One behavior change is worth noting for adopters who expose custom resources: a custom resource whose list kind is reported by the API server as SecretList now has the values of its data field masked, matching how core Kubernetes Secrets have always been handled on other query paths.
Workarounds
- Enable the permission framework and restrict
kubernetes.resources.readto trusted users. - Scope the RBAC of the service account used to reach each cluster so that it cannot read sensitive resource types. The recommended
ClusterRolein the Kubernetes plugin configuration documentation does not grant this access.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @backstage/plugin-kubernetes-backend | < 0.21.9 | 0.21.9 |
References
- https://github.com/backstage/backstage/security/advisories/GHSA-p795-mqf2-36mf
- https://nvd.nist.gov/vuln/detail/CVE-2026-106561
- https://github.com/backstage/backstage/commit/388926ae5734bc20bd6a1520d02896be834f6527
- https://github.com/backstage/backstage
- https://github.com/backstage/backstage/releases/tag/v1.54.2
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N- Weakness (CWE)
CWE-200, CWE-863- Platform
- npm
- Package
@backstage/plugin-kubernetes-backend- Disclosed
- 07.10.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-p795-mqf2-36mf - CC BY 4.0
Vulnerability history: @backstage/plugin-kubernetes-backend
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 10.2026 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 2
- Low 1
Disclosures per year
- 2026: 3
-
Backstage has a sensitive information disclosure in Kubernetes resource queries this entry
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