GHSA-xvgh-hmx8-9xxf

Suggest an improvement
Source
https://github.com/advisories/GHSA-xvgh-hmx8-9xxf
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-xvgh-hmx8-9xxf/GHSA-xvgh-hmx8-9xxf.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-xvgh-hmx8-9xxf
Aliases
Published
2026-10-07T17:59:02Z
Modified
2026-10-07T18:15:10Z
Severity
  • 8.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
Summary
Backstage: Improper task state validation in Scaffolder backend
Details

Impact

An authenticated user with permission to create and access Scaffolder tasks may, under specific timing and deployment conditions, affect files accessible to the Backstage backend. If backend application files are writable, the confidentiality, integrity, and availability of the backend may be compromised.

Patches

Patched in @backstage/plugin-scaffolder-backend version 4.1.0

Workarounds

  • Restrict Scaffolder task creation and task-read permissions to trusted users through the permission policy.
  • Limit who can register or modify templates and which Scaffolder actions may execute.
  • Run backend application files read-only outside a dedicated, least-privilege Scaffolder working directory.

References

Database specific 
{
    "cwe_ids": [
        "CWE-362",
        "CWE-59"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-07T17:59:02Z",
    "nvd_published_at": "2026-10-06T22:17:05Z",
    "severity": "HIGH"
}
References

Affected packages

npm / @backstage/plugin-scaffolder-backend

Package

Name
@backstage/plugin-scaffolder-backend
View open source insights on deps.dev
Purl
pkg:npm/%40backstage/plugin-scaffolder-backend

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.1.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-xvgh-hmx8-9xxf/GHSA-xvgh-hmx8-9xxf.json"