Insertion of Sensitive Information into Log File Affecting @backstage/plugin-scaffolder-backend package, versions <4.1.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-BACKSTAGEPLUGINSCAFFOLDERBACKEND-20825378
- published11 Oct 2026
- disclosed7 Oct 2026
- creditUnknown
Introduced: 7 Oct 2026
NewCVE-2026-106499 (opens in a new tab)How to fix?
Upgrade @backstage/plugin-scaffolder-backend to version 4.1.0 or higher.
Overview
@backstage/plugin-scaffolder-backend is a The Backstage backend plugin that helps you create new things
Affected versions of this package are vulnerable to Insertion of Sensitive Information into Log File via the NunjucksWorkflowRunner in NunjucksWorkflowRunner.ts, where secret values interpolated into each iteration contexts are not redacted from task logs. When a workflow step uses the each construct and secrets are present in the template context, the resolved iteration values derived from those secrets are written to the task log in plaintext, allowing an attacker with access to task logs to recover secret material. The fix introduces a pre-iteration render pass without secrets to identify secret-derived values and register them as redactions before any logging occurs.