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CVE-2026-106509— Backstage: Improper validation of MkDocs theme configuration in TechDocs

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， 包存在一个安全漏洞：对 TechDocs 中 mkdocs 主题配置文件的验证不充分。当 TechDocs 被配置为在本地或容器环境中构建文档时，拥有注册仓库写权限的用户可以在 配置文件中插入特定的配置值，从而在文档构建过程中触发任意代码执行（Arbitrary Code Execution）。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-2026-106509

Vulnerability Information
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Vulnerability Title
Backstage: Improper validation of MkDocs theme configuration in TechDocs
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 improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in mkdocs.yml that cause arbitrary code execution during the documentation build process. 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
对生成代码的控制不恰当(代码注入)
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-2026-106509

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III. Intelligence Information for CVE-2026-106509

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Patches & Fixes for CVE-2026-106509 (2)

Vendor Pages for CVE-2026-106509 (2)

Other References for CVE-2026-106509 (1)

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-2026-106500 8.5 HIGH Backstage: Improper task state validation in Scaffolder backend
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-2026-106505 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-2026-106504 6.5 MEDIUM Backstage: Sensitive information exposure in scaffolder task logs
CVE-2026-106458 6.5 MEDIUM Backstage: Inconsistent repository filtering in Bitbucket Server catalog event updates
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-94

V. Comments for CVE-2026-106509

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