CVE-2026-106488— Backstage: Improper authentication in the OIDC provider
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源框架。在版本 0.4.20 之前，@backstage/plugin-auth-backend-module-oidc-provider 包中存在 OIDC 提供商身份验证不当的问题。如果部署使用了 OIDC 基于电子邮件的身份解析，并且所配置的 OIDC 提供商允许使用未经核实的电子邮件地址，则已认证的提供商用户可能会冒充目录（Catalog）中的另一个用户身份。这可能导致攻击者获得与该冒充用户关联的访问权限和权限级别。目前没有证据表明该漏洞会直接影响系统的可用性
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I. Basic Information for CVE-2026-106488
Vulnerability Information
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Vulnerability Title
Backstage: Improper authentication in the OIDC provider
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Prior to 0.4.20, the @backstage/plugin-auth-backend-module-oidc-provider package is affected by improper authentication in the oidc provider. Deployments using OIDC email-based identity resolution with a provider that permits unverified email addresses may allow an authenticated provider user to assume another catalog identity. This may grant access and permissions associated with that user. No direct availability impact is demonstrated. This issue is fixed in version 0.4.20.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| backstage | backstage | < 1.54.6 | - |
|
| @backstage | plugin-auth-backend-module-oidc-provider | < 0.4.20 | - |
|
II. Public POCs for CVE-2026-106488
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Pages for CVE-2026-106488 (1)
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🔗 Release v1.54.6 · backstage/backstage · GitHub x_refsource_MISC
Other References for CVE-2026-106488 (2)
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https://github.com/backstage/backstage/security/advisories/GHSA-826h-28h9-65hg x_refsource_CONFIRM
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-2026-106455 | 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-2026-106487 | 3.5 LOW | Backstage: Unsupported catalog cluster authentication mode in kubernetes backend |
| CVE-2026-106493 | 3.0 LOW | Backstage: Cloud storage catalog locations may cross configured storage boundaries |
IV. Related Vulnerabilities
Same product: backstage
-
CVE-2026-106494
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CVE-2026-106493
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CVE-2026-106492
Backstage: Improper preservation of access restrictions duri -
CVE-2026-106491
Backstage: Improper input validation in proxy-backend -
CVE-2026-106490
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Same vendor: backstage
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CVE-2026-106494
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CVE-2026-106493
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CVE-2026-106491
Backstage: Improper input validation in proxy-backend -
CVE-2026-106490
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Same weakness: CWE-287
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CVE-2026-106460
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CVE-2026-106457
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UAA OAuth Token Endpoint Vulnerability allows user access to
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