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CVE-2026-106558— Backstage: Improper validation of TechDocs MkDocs 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 1.14.8、1.15.6 和 2.0.1 之前， 包在验证映射样式（mapping-style）的 配置时存在缺陷。具有认证身份的攻击者若能注册或操控基于源代码管理（SCM）的文档源，便可绕过 TechDocs 的 sanitization（清理/过滤）机制，导致在生成器运行时环境中导入并实例化 Python 对象，从而引发任意代码执行漏洞。此前在版本 1.14.6 和 1.15.4 中的修复并未完全解决 所支持的映射表示形式的问题。当文档生成过程以

CVSS 8.8 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-106558

Vulnerability Information
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Vulnerability Title
Backstage: Improper validation of TechDocs MkDocs configuration
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Prior to 1.14.8, 1.15.6, and 2.0.1, the @backstage/plugin-techdocs-node package improperly validated mapping-style markdown_extensions configuration. An authenticated attacker who can register or influence an SCM-backed documentation source may bypass TechDocs sanitization and cause Python objects to be imported and instantiated in the generator runtime, leading to arbitrary code execution. Earlier fixes in versions 1.14.6 and 1.15.4 did not fully address the supported mapping representation of markdown_extensions. Impact is greatest when documentation generation runs with backend credentials, filesystem access, or internal network access. This issue is fixed in versions 1.14.8, 1.15.6, and 2.0.1.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
backstage backstage < 1.50.7 -
@backstage plugin-techdocs-node < 1.14.8 -

II. Public POCs for CVE-2026-106558

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III. Intelligence Information for CVE-2026-106558

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Other References for CVE-2026-106558 (7)

Same Patch Batch · backstage · 2026-10-07 · 9 CVEs total

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-2026-106557 7.7 HIGH Backstage: Improper input validation in TechDocs Markdown extension configuration
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-502

V. Comments for CVE-2026-106558

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