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CVE-2026-106561— Backstage: Sensitive information disclosure in Kubernetes resource queries

Quick assessment

Affected
backstage backstage
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Backstage 是一个用于构建开发者门户的开放框架。在版本 0.21.9 之前，@backstage/plugin-kubernetes-backend 插件在 Kubernetes 资源查询中存在敏感信息泄露漏洞。拥有标准 Kubernetes 资源读取权限的已认证用户，可以获取到 Kubernetes 插件本应遮蔽的敏感值，从而可能泄露连接集群中存储的凭证和其他机密信息。泄露范围仅限于 Backstage 服务账号有权读取且匹配目标目录实体的命名空间和标签选择器的资源。如果部署的集群凭据未授予对这些资源的读

CVSS 5.0 · Medium

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-106561

Vulnerability Information
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Vulnerability Title
Backstage: Sensitive information disclosure in Kubernetes resource queries
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
backstage backstage < 1.54.2 -
@backstage plugin-kubernetes-backend < 0.21.9 -

II. Public POCs for CVE-2026-106561

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III. Intelligence Information for CVE-2026-106561

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Other References for CVE-2026-106561 (3)

Same Patch Batch · backstage · 2026-10-07 · 8 CVEs total

CVE-2026-106558 8.8 HIGH Backstage: Improper validation of TechDocs MkDocs configuration
CVE-2026-106510 7.7 HIGH Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.yml
CVE-2026-106556 7.7 HIGH Backstage: Configuration bypass in TechDocs mkdocs.yml sanitization
CVE-2026-106560 7.1 HIGH Backstage: Improper repository path validation in a Scaffolder backend module
CVE-2026-106559 6.3 MEDIUM Backstage: Improper input validation in Confluence to Markdown scaffolder module
CVE-2026-106563 5.3 MEDIUM Backstage: Improper entity validation in deprecated Kubernetes services endpoint
CVE-2026-106562 4.3 MEDIUM Backstage: Incorrect authorization in search engine permission filtering

IV. Related Vulnerabilities

Same product: backstage
Same vendor: backstage
Same weakness: CWE-200

V. Comments for CVE-2026-106561

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