CVE-2026-106503— Backstage: Scaffolder action input authorization bypass
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 3.3.1、3.4.1、4.0.3 和 4.1.0 版本之前，@backstage/plugin-scaffolder-backend 软件包存在 Scaffolder 动作输入授权绕过漏洞。具有受影响 Scaffolder 模板访问权限的已认证用户可绕过配置的动作限制。根据集成凭据的不同，这可能导致对代码仓库及相关源代码控制资源的未授权访问。此问题已在版本 3.3.1、3.4.1、4.0.3 和 4.1.0 中得到修复。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-106503
Vulnerability Information
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Vulnerability Title
Backstage: Scaffolder action input authorization bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by scaffolder action input authorization bypass. An authenticated user with access to affected Scaffolder templates could bypass configured action restrictions. Depending on integration credentials, this could grant unauthorized access to repositories and related source-control resources. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.
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
大小写敏感处理不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| backstage | backstage | < 1.49.6 | - |
|
| @backstage | plugin-scaffolder-backend | < 3.3.1 | - |
|
II. Public POCs for CVE-2026-106503
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Pages for CVE-2026-106503 (2)
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🔗 Release v1.50.5 · backstage/backstage · GitHub x_refsource_MISC
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🔗 Release v1.54.6 · backstage/backstage · GitHub x_refsource_MISC
Other References for CVE-2026-106503 (5)
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https://github.com/backstage/backstage/releases/tag/v1.49.6 x_refsource_MISC
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https://github.com/backstage/backstage/security/advisories/GHSA-hmp2-4m7g-22cv x_refsource_CONFIRM
Same Patch Batch · backstage · 2026-10-06 · 32 CVEs total
| CVE-2026-106501 | 9.6 CRITICAL | Backstage: Sensitive information exposure in Scaffolder |
| CVE-2026-106500 | 8.5 HIGH | Backstage: Improper task state validation in Scaffolder backend |
| 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-2026-106498 | 7.7 HIGH | Backstage: Improper URL validation in catalog entity placeholder resolution |
| CVE-2026-106509 | 7.7 HIGH | Backstage: Improper validation of MkDocs theme configuration in TechDocs |
| CVE-2026-106505 | 7.7 HIGH | Backstage: Bypass of MkDocs configuration sanitizer in TechDocs backend |
| 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-2026-106490 | 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-2026-106458 | 6.5 MEDIUM | Backstage: Inconsistent repository filtering in Bitbucket Server catalog event updates |
| CVE-2026-106504 | 6.5 MEDIUM | Backstage: Sensitive information exposure in scaffolder task logs |
| CVE-2026-106491 | 6.4 MEDIUM | Backstage: Improper input validation in proxy-backend |
| CVE-2026-106462 | 6.4 MEDIUM | Backstage: Scaffolder credential handling may allow unintended GitHub authentication fallb |
| CVE-2026-106463 | 5.4 MEDIUM | Backstage: Improper authorization in GitLab organizational user ingestion |
| CVE-2026-106506 | 5.3 MEDIUM | Backstage: Improper input validation in scaffolder task list ordering |
Showing top 20 of 32 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: backstage
-
CVE-2026-106509
Backstage: Improper validation of MkDocs theme configuration -
CVE-2026-106508
Backstage: Potential file exposure through local TechDocs pu -
CVE-2026-106507
Backstage: TechDocs arbitrary file read via mkdocs snippets -
CVE-2026-106506
Backstage: Improper input validation in scaffolder task list -
CVE-2026-106505
Backstage: Bypass of MkDocs configuration sanitizer in TechD
Same vendor: backstage
-
CVE-2026-106509
Backstage: Improper validation of MkDocs theme configuration -
CVE-2026-106508
Backstage: Potential file exposure through local TechDocs pu -
CVE-2026-106507
Backstage: TechDocs arbitrary file read via mkdocs snippets -
CVE-2026-106506
Backstage: Improper input validation in scaffolder task list -
CVE-2026-106505
Backstage: Bypass of MkDocs configuration sanitizer in TechD
Same weakness: CWE-178
-
CVE-2026-106497
Backstage: Inconsistent catalog property permission evaluati -
CVE-2026-100693
Hugo v0.162.0 before v0.166.0 IP-literal Deny Rule Bypass -
CVE-2026-100669
Grav before 2.0.25 Sensitive File Disclosure via Case-Variat -
CVE-2026-100580
OpenClaw before 2026.7.1 Remote Code Execution via cron tool -
CVE-2026-100541
OpenClaw Matrix before 2026.8.1 Authorization Bypass via Cas
V. Comments for CVE-2026-106503
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