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GHSA-hmp2-4m7g-22cv

Backstage: Scaffolder action input authorization bypass

Source: GitHub Advisory Database (reviewed) High CVE-2026-106503

Packages

EcosystemPackageAffectedFixed in
npm @backstage/plugin-scaffolder-backend < 3.3.1 3.3.1
npm @backstage/plugin-scaffolder-backend >= 3.4.0, < 3.4.1 3.4.1
npm @backstage/plugin-scaffolder-backend >= 4.0.0, < 4.0.3 4.0.3
npm @backstage/plugin-scaffolder-backend >= 4.0.4, < 4.1.0 4.1.0

Details

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

### Impact An authenticated user with access to affected Scaffolder templates could bypass configured action restrictions. Depending on integration credentials, this could grant unauthorized access to repositories and related source-control resources. ### Patches Patched in `@backstage/plugin-scaffolder-backend` version `4.1.0` ### Workarounds - Restrict affected Scaffolder actions to trusted users and configure source-control integrations with least-privilege credentials.

References

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