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CVE-2026-88064— Backstage: Improper input validation in 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 1.14.6 之前，以及从 1.15.0 到 1.15.4 的版本中， 包对由具备注册或修改 TechDocs 源的权限的认证用户提供的 文件验证不足。不安全的 Python YAML 标签、 的名称与配置、主题选项以及 的值可以传递至文档生成器，从而触发非预期的代码执行。由此带来的影响仅限于 TechDocs 后端或构建容器所可访问的文件、凭证、网络访问权限及其他资源。该问题已在版本 1.14.6 和 1.15.4 中修复。

CVSS 8.8 · High
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I. Basic Information for CVE-2026-88064

Vulnerability Information
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Vulnerability Title
Backstage: Improper input validation in TechDocs MkDocs configuration
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Prior to 1.14.6 and from 1.15.0 until 1.15.4, the @backstage/plugin-techdocs-node package insufficiently validates mkdocs.yml supplied by an authenticated user who can register or modify a TechDocs source. Unsafe Python YAML tags, markdown_extensions names and configuration, theme options, and extra_templates values can reach the documentation generator and cause unintended code execution. The resulting impact is limited to the files, credentials, network access, and other resources available 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:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
backstage backstage < 1.14.6 -

II. Public POCs for CVE-2026-88064

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III. Intelligence Information for CVE-2026-88064

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Patches & Fixes for CVE-2026-88064 (5)

Vendor Advisories for CVE-2026-88064 (1)

Vendor Pages for CVE-2026-88064 (2)

IV. Related Vulnerabilities

Same product: backstage
Same vendor: backstage
Same weakness: CWE-20

V. Comments for CVE-2026-88064

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