GitHub Advisoryadvisory · npm
GHSA-4xvq-3m68-h444 Backstage has sensitive information exposure in scaffolder task logs
MEDIUM
Official page ↗
- Aliases
- CVE-2026-106504
- Ecosystem
- npm
- Packages
- @backstage/plugin-scaffolder-backend
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-532
- Reviewed
- 2026-10-07
Affected packages
• npm @backstage/plugin-scaffolder-backend: < 4.1.0 → fixed in 4.1.0
Description
Impact
An authenticated user who can create and read scaffolder tasks may be able to observe sensitive values in task logs in deployments with restrictive action permissions and affected templates. Exploitation requires a denied action whose input contains such a value.
Patches
Patched in `@backstage/plugin-scaffolder-backend` version `4.1.0`
Workarounds
• Restrict scaffolder task creation and task-log reading to trusted users.
• Avoid placing centrally managed sensitive values in inputs to actions that may be denied until upgrading.
References
• Backstage threat model
• Backstage permissions overview
Related
Alias · CVE (1)
- CVE-2026-106504 Backstage is an open framework for building developer portals. vulnerability
Weakness · CWE (1)
- CWE-532 Insertion of Sensitive Information into Log File weakness
References
- https://github.com/backstage/backstage/security/advisories/GHSA-4xvq-3m68-h444 web
- https://nvd.nist.gov/vuln/detail/CVE-2026-106504 advisory
- https://github.com/backstage/backstage/commit/3eb3dc59eb0da0deccd532f19eb460bb452c9efb web
- https://github.com/backstage/backstage package
- https://github.com/backstage/backstage/releases/tag/v1.54.6 web