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CVE-2026-106500— Backstage: Improper task state validation in Scaffolder 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 是一个用于构建开发者门户的开源框架。在版本 3.3.1、3.4.1、4.0.3 和 4.1.0 之前，@backstage/plugin-scaffolder-backend 包存在任务状态验证不当的问题。经过身份验证且具有创建和访问 Scaffolder 任务权限的用户，在特定的时间条件和部署环境下，可能影响 Backstage 后端可访问的文件。如果后端应用程序文件可写，后端机密性、完整性和可用性可能会受到损害。该问题已在版本 3.3.1、3.4.1、4.0.3 和 4.1.0 中得到修复。

CVSS 8.5 · High
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I. Basic Information for CVE-2026-106500

Vulnerability Information
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Vulnerability Title
Backstage: Improper task state validation in Scaffolder backend
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 improper task state validation in scaffolder backend. An authenticated user with permission to create and access Scaffolder tasks may, under specific timing and deployment conditions, affect files accessible to the Backstage backend. If backend application files are writable, the confidentiality, integrity, and availability of the backend may be compromised. 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:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
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-2026-106500

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III. Intelligence Information for CVE-2026-106500

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Vendor Pages for CVE-2026-106500 (2)

Other References for CVE-2026-106500 (5)

Same Patch Batch · backstage · 2026-10-06 · 32 CVEs total

CVE-2026-106501 9.6 CRITICAL Backstage: Sensitive information exposure in Scaffolder
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-2026-106503 8.1 HIGH Backstage: Scaffolder action input authorization bypass
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 &rarr; →

IV. Related Vulnerabilities

Same product: backstage
Same vendor: backstage
Same weakness: CWE-59

V. Comments for CVE-2026-106500

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