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

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 是用于构建开发者门户的开放框架。在版本 0.21.10 之前， 包存在 Kubernetes 后端中不受支持的目录集群认证模式问题。当目录（catalog）贡献者可以创建或修改 资源实体时，使用目录集群发现功能的部署可能会受到影响。在具备必要端点权限和 Pod RBAC（基于角色的访问控制）的情况下，后端可以以其本地集群内身份进行操作，从而可能暴露该身份可读取的 Kubernetes 资源。该凭证仅用于本地集群内 API 端点，不会发送至目录提供的端点。此问题已在版本 0.21.10 中修复。

CVSS 3.5 · Low
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I. Basic Information for CVE-2026-106487

Vulnerability Information
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Vulnerability Title
Backstage: Unsupported catalog cluster authentication mode in kubernetes backend
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未有动机的代理或中间人(混淆代理)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
backstage backstage < 1.54.6 -
@backstage plugin-kubernetes-backend < 0.21.10 -

II. Public POCs for CVE-2026-106487

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III. Intelligence Information for CVE-2026-106487

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Vendor Pages for CVE-2026-106487 (1)

Other References for CVE-2026-106487 (2)

Same Patch Batch · backstage · 2026-10-06 · 18 CVEs total

CVE-2026-106486 8.5 HIGH Backstage: Improper filesystem validation in Bitbucket pull-request scaffolder actions
CVE-2026-106459 8.5 HIGH Backstage: Improper input validation in Sentry scaffolder actions
CVE-2026-106488 8.1 HIGH Backstage: Improper authentication in the OIDC provider
CVE-2026-106455 7.7 HIGH Backstage: Improper validation of MkDocs plugin configuration in TechDocs
CVE-2026-106492 7.6 HIGH Backstage: Improper preservation of access restrictions during service credential delegati
CVE-2026-106460 6.8 MEDIUM Backstage: Explicit negative email verification can be ignored during shared OAuth profile
CVE-2026-106457 6.8 MEDIUM Backstage: Insufficient audience validation in the Cloudflare Access auth provider
CVE-2026-106458 6.5 MEDIUM Backstage: Inconsistent repository filtering in Bitbucket Server catalog event updates
CVE-2026-106490 6.5 MEDIUM Backstage: Improper input validation in TechDocs static content requests
CVE-2026-106489 6.5 MEDIUM Backstage: Improper authorization enforcement for TechDocs static content
CVE-2026-106462 6.4 MEDIUM Backstage: Scaffolder credential handling may allow unintended GitHub authentication fallb
CVE-2026-106491 6.4 MEDIUM Backstage: Improper input validation in proxy-backend
CVE-2026-106463 5.4 MEDIUM Backstage: Improper authorization in GitLab organizational user ingestion
CVE-2026-106456 4.8 MEDIUM Backstage: Inconsistent credential enforcement for overlapping proxy routes
CVE-2026-106494 4.4 MEDIUM Backstage: Improper input validation in cloud storage URL readers
CVE-2026-106461 4.3 MEDIUM Backstage: Incorrect authorization in scaffolder task listing
CVE-2026-106493 3.0 LOW Backstage: Cloud storage catalog locations may cross configured storage boundaries

IV. Related Vulnerabilities

Same product: backstage
Same vendor: backstage
Same weakness: CWE-441

V. Comments for CVE-2026-106487

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