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CVE-2026-29185— @backstage/integration: Potential reading of SCM URLs using built in token

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 1.20.1之前版本存在路径遍历漏洞，该漏洞源于SCM URL解析存在路径遍历问题，可能导致请求被重定向到非预期的SCM提供商API端点。

CVSS 2.7 · Low EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-29185

Vulnerability Information
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Vulnerability Title
@backstage/integration: Potential reading of SCM URLs using built in token
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Prior to version 1.20.1, a vulnerability in the SCM URL parsing used by Backstage integrations allowed path traversal sequences in encoded form to be included in file paths. When these URLs were processed by integration functions that construct API URLs, the traversal segments could redirect requests to unintended SCM provider API endpoints using the configured server-side integration credentials. This issue has been patched in version 1.20.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/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
Vulnerability Title
Backstage 路径遍历漏洞
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 1.20.1之前版本存在路径遍历漏洞，该漏洞源于SCM URL解析存在路径遍历问题，可能导致请求被重定向到非预期的SCM提供商API端点。
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 < 1.20.1 -

II. Public POCs for CVE-2026-29185

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III. Intelligence Information for CVE-2026-29185

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Vendor Advisories for CVE-2026-29185 (1)

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

CVE-2026-29186 7.7 HIGH @backstage/plugin-techdocs-node: TechDocs Mkdocs Configuration Key Enables Arbitrary Code
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-22

V. Comments for CVE-2026-29185

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