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GHSA-4xvq-3m68-h444

Backstage has sensitive information exposure in scaffolder task logs

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-106504

Packages

EcosystemPackageAffectedFixed in
npm @backstage/plugin-scaffolder-backend < 4.1.0 4.1.0

Details

As written in the advisory (Markdown source, shown as plain text).

### 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](https://backstage.io/docs/overview/threat-model/) - [Backstage permissions overview](https://backstage.io/docs/permissions/overview/)

References

External links from the advisory. They lead to third-party sites.