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CVE-2026-24046— Backstage has a Possible Symlink Path Traversal in Scaffolder Actions

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存在后置链接漏洞，该漏洞源于多个Scaffolder操作和存档提取工具容易受到基于符号链接的路径遍历攻击，可能导致读取、删除或写入任意文件。

CVSS 7.1 · High EPSS 0.53% · P43

Affected Version Matrix 8

VendorProduct Version RangeStatus
backstage backstage @backstage/backend-defaults < 0.12.2 affected
@backstage/backend-defaults >= 0.13.0, < 0.13.2 affected
@backstage/backend-defaults >= 0.14.0, < 0.14.1 affected
@backstage/plugin-scaffolder-backend < 2.2.2 affected
@backstage/plugin-scaffolder-backend >= 3.0.0, < 3.0.2 affected
@backstage/plugin-scaffolder-backend >= 3.1.0, < 3.1.1 affected
@backstage/plugin-scaffolder-node < 0.11.2 affected
@backstage/plugin-scaffolder-node >= 0.12.0, < 0.12.3 affected
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I. Basic Information for CVE-2026-24046

Vulnerability Information
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Vulnerability Title
Backstage has a Possible Symlink Path Traversal in Scaffolder Actions
Source: CVE Program / CVE List V5
Vulnerability Description
Backstage is an open framework for building developer portals. Multiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to read arbitrary files via the `debug:log` action by creating a symlink pointing to sensitive files (e.g., `/etc/passwd`, configuration files, secrets); delete arbitrary files via the `fs:delete` action by creating symlinks pointing outside the workspace, and write files outside the workspace via archive extraction (tar/zip) containing malicious symlinks. This affects any Backstage deployment where users can create or execute Scaffolder templates. This vulnerability is fixed in `@backstage/backend-defaults` versions 0.12.2, 0.13.2, 0.14.1, and 0.15.0; `@backstage/plugin-scaffolder-backend` versions 2.2.2, 3.0.2, and 3.1.1; and `@backstage/plugin-scaffolder-node` versions 0.11.2 and 0.12.3. Users should upgrade to these versions or later. Some workarounds are available. Follow the recommendation in the Backstage Threat Model to limit access to creating and updating templates, restrict who can create and execute Scaffolder templates using the permissions framework, audit existing templates for symlink usage, and/or run Backstage in a containerized environment with limited filesystem access.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L
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 后置链接漏洞
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存在后置链接漏洞，该漏洞源于多个Scaffolder操作和存档提取工具容易受到基于符号链接的路径遍历攻击，可能导致读取、删除或写入任意文件。
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 @backstage/backend-defaults < 0.12.2 -

II. Public POCs for CVE-2026-24046

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III. Intelligence Information for CVE-2026-24046

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Vendor Advisories for CVE-2026-24046 (1)

Same Patch Batch · backstage · 2026-01-21 · 3 CVEs total

CVE-2026-24047 6.3 MEDIUM @backstage/cli-common has a possible `resolveSafeChildPath` Symlink Chain Bypass
CVE-2026-24048 3.5 LOW Backstage has a Possible SSRF when reading from allowed URL's in `backend.reading.allow`

IV. Related Vulnerabilities

Same product: backstage
Same vendor: backstage
Same weakness: CWE-22

V. Comments for CVE-2026-24046

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