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CVE-2026-106556— Backstage: Configuration bypass in TechDocs mkdocs.yml sanitization

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 1.14.6 之前， 包存在 TechDocs mkdocs.yml 配置校验绕过漏洞。在生成 TechDocs 期间，对 MkDocs 配置缺乏充分的验证，可能导致具有注册或修改文档源权限的已认证用户在构建环境中执行任意命令。该漏洞的影响范围仅限于 TechDocs 后端或构建容器可访问的资源。该问题已在版本 1.14.6 和 1.15.4 中得到修复。

CVSS 7.7 · High
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I. Basic Information for CVE-2026-106556

Vulnerability Information
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Vulnerability Title
Backstage: Configuration bypass in TechDocs mkdocs.yml sanitization
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could allow an authenticated user who can register or modify documentation sources to execute arbitrary commands in the build environment. Impact is limited to resources accessible to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
backstage backstage < 1.50.5 -
@backstage plugin-techdocs-node < 1.14.6 -

II. Public POCs for CVE-2026-106556

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III. Intelligence Information for CVE-2026-106556

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Patches & Fixes for CVE-2026-106556 (1)

Vendor Pages for CVE-2026-106556 (2)

Other References for CVE-2026-106556 (2)

Same Patch Batch · backstage · 2026-10-07 · 8 CVEs total

CVE-2026-106558 8.8 HIGH Backstage: Improper validation of TechDocs MkDocs configuration
CVE-2026-106510 7.7 HIGH Backstage: Remote code execution via crafted markdown_extensions in TechDocs mkdocs.yml
CVE-2026-106560 7.1 HIGH Backstage: Improper repository path validation in a Scaffolder backend module
CVE-2026-106559 6.3 MEDIUM Backstage: Improper input validation in Confluence to Markdown scaffolder module
CVE-2026-106563 5.3 MEDIUM Backstage: Improper entity validation in deprecated Kubernetes services endpoint
CVE-2026-106561 5.0 MEDIUM Backstage: Sensitive information disclosure in Kubernetes resource queries
CVE-2026-106562 4.3 MEDIUM Backstage: Incorrect authorization in search engine permission filtering

IV. Related Vulnerabilities

Same product: backstage
Same vendor: backstage
Same weakness: CWE-78

V. Comments for CVE-2026-106556

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