CVE-2026-24046 (GCVE-0-2026-24046)

Vulnerability from cvelistv5 – Published: 2026-01-21 22:36 – Updated: 2026-01-21 22:36
VLAI?
Title
Backstage has a Possible Symlink Path Traversal in Scaffolder Actions
Summary
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.
Severity ?
7.1 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  • CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
Impacted products
Vendor Product Version
backstage backstage Affected: @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
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          "vendor": "backstage",
          "versions": [
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        {
          "descriptions": [
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              "description": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      "source": {
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        "discovery": "UNKNOWN"
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      "title": "Backstage has a Possible Symlink Path Traversal in Scaffolder Actions"
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    "datePublished": "2026-01-21T22:36:30.794Z",
    "dateReserved": "2026-01-20T22:30:11.777Z",
    "dateUpdated": "2026-01-21T22:36:30.794Z",
    "state": "PUBLISHED"
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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