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CVE-2026-106557— Backstage: Improper input validation in TechDocs Markdown extension configuration

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 和 1.15.4 之前，@backstage/plugin-techdocs-node 包未能充分验证 TechDocs Markdown 扩展配置。具有注册或修改文档来源权限的已认证用户可能触发 TechDocs 构建过程，使其访问超出预期文档边界的资源，从而潜在地暴露后端托管数据或内部网络资源。该问题已在版本 1.14.6 和 1.15.4 中得到修复，前提是同时使用 pymdown-extensions 10.21.3 或更高版本（

CVSS 7.7 · High
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I. Basic Information for CVE-2026-106557

Vulnerability Information
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Vulnerability Title
Backstage: Improper input validation in TechDocs Markdown extension configuration
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package did not sufficiently validate TechDocs Markdown extension configuration. An authenticated user who can register or modify documentation sources may cause a TechDocs build to access resources outside the intended documentation boundary, potentially exposing backend-host data or internal network resources. This issue is fixed in versions 1.14.6 and 1.15.4 when pymdown-extensions 10.21.3 or later is also used, normally through mkdocs-techdocs-core 1.7.0 or later.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
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-2026-106557

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III. Intelligence Information for CVE-2026-106557

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Patches & Fixes for CVE-2026-106557 (1)

Vendor Pages for CVE-2026-106557 (2)

Other References for CVE-2026-106557 (2)

Same Patch Batch · backstage · 2026-10-07 · 9 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-2026-106556 7.7 HIGH Backstage: Configuration bypass in TechDocs mkdocs.yml sanitization
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-22

V. Comments for CVE-2026-106557

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