Backstage: Sensitive information disclosure in Kubernetes resource queries

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-106561
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-07 15:17:17 UTC
Updated2026-10-07 15:52:18 UTC
DescriptionBackstage is an open framework for building developer portals. Prior to 0.21.9, the @backstage/plugin-kubernetes-backend package is affected by sensitive information disclosure in kubernetes resource queries. 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. This issue is fixed in version 0.21.9.

Risk And Classification

Primary CVSS: v3.1 5 MEDIUM from [email protected]

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

Problem Types: CWE-200 | CWE-863 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
3.1CNADECLARED5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Backstage Backstage affected < 1.54.2 Not specified
CNA @backstage Plugin-kubernetes-backend affected < 0.21.9 Not specified

References

ReferenceSourceLinkTags
github.com/backstage/backstage/commit/388926ae5734bc20bd6a1520d02896be83... [email protected] github.com
github.com/backstage/backstage/security/advisories/GHSA-p795-mqf2-36mf [email protected] github.com
github.com/backstage/backstage/releases/tag/v1.54.2 [email protected] github.com
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