CVE-2026-106456— Backstage: Inconsistent credential enforcement for overlapping proxy routes
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 0.5.0 至 0.6.18 之间， 包存在凭证强制执行不一致的问题，涉及重叠的代理路由。操作人员可以配置具有不同凭证要求的重叠代理路径。当父级路径允许未经身份验证的访问，而嵌套路径需要凭证时，父级路径的免验证设置可能会覆盖由嵌套代理处理的请求。因此，未经身份验证的调用者可能通过 Backstage 访问嵌套的上游服务，包括使用为该代理配置的静态上游凭证。该问题已在版本 0.6.18 中修复。
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I. Basic Information for CVE-2026-106456
Vulnerability Information
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Vulnerability Title
Backstage: Inconsistent credential enforcement for overlapping proxy routes
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. From 0.5.0 until 0.6.18, the @backstage/plugin-proxy-backend package is affected by inconsistent credential enforcement for overlapping proxy routes. An operator can configure overlapping proxy paths with different credential requirements. When a parent path permits unauthenticated access and a nested path requires credentials, the parent exemption can also cover requests handled by the nested proxy. An unauthenticated caller may therefore reach the nested upstream through Backstage, including with static upstream credentials configured for that proxy. This issue is fixed in version 0.6.18.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| backstage | backstage | >= 1.28.0, < 1.55.0 | - |
|
| @backstage | plugin-proxy-backend | >= 0.5.0, < 0.6.18 | - |
|
II. Public POCs for CVE-2026-106456
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-106456 (3)
-
https://github.com/backstage/backstage/releases/tag/v1.55.0 x_refsource_MISC
-
https://github.com/backstage/backstage/security/advisories/GHSA-472h-9c5j-prrr x_refsource_CONFIRM
Same Patch Batch · backstage · 2026-10-06 · 18 CVEs total
| CVE-2026-106459 | 8.5 HIGH | Backstage: Improper input validation in Sentry scaffolder actions |
| CVE-2026-106486 | 8.5 HIGH | Backstage: Improper filesystem validation in Bitbucket pull-request 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-2026-106494 | 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
Backstage: Improper input validation in cloud storage URL re -
CVE-2026-106493
Backstage: Cloud storage catalog locations may cross configu -
CVE-2026-106492
Backstage: Improper preservation of access restrictions duri -
CVE-2026-106491
Backstage: Improper input validation in proxy-backend -
CVE-2026-106490
Backstage: Improper input validation in TechDocs static cont
Same vendor: backstage
-
CVE-2026-106494
Backstage: Improper input validation in cloud storage URL re -
CVE-2026-106493
Backstage: Cloud storage catalog locations may cross configu -
CVE-2026-106492
Backstage: Improper preservation of access restrictions duri -
CVE-2026-106491
Backstage: Improper input validation in proxy-backend -
CVE-2026-106490
Backstage: Improper input validation in TechDocs static cont
Same weakness: CWE-863
-
CVE-2026-106463
Backstage: Improper authorization in GitLab organizational u -
CVE-2026-106461
Backstage: Incorrect authorization in scaffolder task listin -
CVE-2026-106458
Backstage: Inconsistent repository filtering in Bitbucket Se -
CVE-2026-103007
Incorrect Authorization in Elasticsearch Leading to Privileg -
CVE-2026-102412
Incorrect Authorization in Kibana Leading to Sensitive Infor
V. Comments for CVE-2026-106456
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