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CVE-2026-29186— @backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution

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Backstage开源的一个应用软件。后台是一个开放的平台,用于构建开发者门户。 Backstage 1.14.3之前版本存在代码问题漏洞，该漏洞源于配置允许列表存在缺陷，可能导致任意Python代码执行。

CVSS 7.7 · High EPSS 0.91% · P59

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
backstage backstage < 1.14.3 affected
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I. Basic Information for CVE-2026-29186

Vulnerability Information
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Vulnerability Title
@backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an mkdocs.yml that causes arbitrary Python code execution, completely bypassing TechDocs' security controls. This issue has been patched in version 1.14.3.
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
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
Backstage 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Backstage是Backstage开源的一个应用软件。后台是一个开放的平台,用于构建开发者门户。 Backstage 1.14.3之前版本存在代码问题漏洞，该漏洞源于配置允许列表存在缺陷，可能导致任意Python代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
backstage backstage < 1.14.3 -

II. Public POCs for CVE-2026-29186

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III. Intelligence Information for CVE-2026-29186

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Vendor Advisories for CVE-2026-29186 (1)

Same Patch Batch · backstage · 2026-03-07 · 3 CVEs total

CVE-2026-29185 2.7 LOW @backstage/integration: Potential reading of SCM URLs using built in token
CVE-2026-29184 2.0 LOW @backstage/plugin-scaffolder-backend: Potential Session Token Exfiltration via Log Redacti

IV. Related Vulnerabilities

Same product: backstage
Same vendor: backstage
Same weakness: CWE-434

V. Comments for CVE-2026-29186

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