@backstage/plugin-scaffolder-backend Vulnerable to Potential Session Token Exfiltration via Log Redaction Bypass

Impact

A malicious scaffolder template can bypass the log redaction mechanism to exfiltrate secrets provided run through task event logs.

The attack requires:

• The ability to register a template in the catalog
• A victim who executes the malicious template

Patches

Patched in @backstage/plugin-scaffolder-backend version 3.1.4

Workarounds

• Implement a custom permission policy that restricts scaffolder.task.read so users can only read their own task logs
• Restrict who can register templates in the catalog to trusted users only

Resources

• Backstage Scaffolder permissions documentation: https://backstage.io/docs/permissions/plugin-authors/01-setup/
• Backstage Threat Model: https://backstage.io/docs/overview/threat-model/