Bug 2547515 (CVE-2026-106561)

Summary: CVE-2026-106561 plugin-kubernetes-backend: Backstage plugin-kubernetes-backend: Information disclosure in Kubernetes resource queries
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abarbaro, alizardo, dschmidt, ikhan, jchui, jhe, jlanda, kshier, ktsao, nboldt, oaljalju, psrna, rbobbitt, simaishi, stcannon, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Backstage Kubernetes backend plugin (plugin-kubernetes-backend). An authenticated user with standard resource read permissions can retrieve sensitive values from Kubernetes queries that the plugin is designed to mask. This flaw allows information disclosure, potentially exposing confidential cluster data and credentials accessible to the service account.
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Description OSIDB Bzimport 2026-10-07 15:06:34 UTC 
Backstage 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.