CVE-2026-29184
@backstage/plugin-scaffolder-backend Vulnerable to Potential Session Token Exfiltration via Log Redaction Bypass
Impact
### 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/
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @backstage/plugin-scaffolder-backend | <= 3.1.3 | 3.1.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linuxfoundation | Backstage\/Plugin-Scaffolder-Backend | before 3.1.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/backstage/backstage/security/advisories/GHSA-8qp7-fhr9-fw53
- https://github.com/advisories/GHSA-8qp7-fhr9-fw53
- https://backstage.io/docs/overview/threat-model
- https://backstage.io/docs/permissions/plugin-authors/01-setup
- https://nvd.nist.gov/vuln/detail/CVE-2026-29184