CVE-2026-106499

Backstage: Secret-derived values may be exposed in scaffolder task logs

Description

Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package could expose secret-derived values in Scaffolder task logs. Deployments that configure sensitive scaffolder.defaultEnvironment.secrets and allow an attacker to create or modify Scaffolder templates are affected. A template author could cause secret-derived values used during template iteration to be persisted and exposed to users who can access the resulting task logs. This issue is fixed in version 4.1.0.

Scores

Weaknesses (CWE)

• CWE-532

Advisories

• GHSA-mfvq-x7vr-rgqg — Backstage: Secret-derived values may be exposed in scaffolder task logs

European references

• ENISA EUVD · EUVD-2026-94057
• GCVE · GCVE-0-2026-106499

Affected configurations (NVD CPE)

• cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:* < 4.1.0
• cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:* < 1.54.6

Affected products

References

• https://github.com/backstage/backstage/security/advisories/GHSA-mfvq-x7vr-rgqg
• https://github.com/backstage/backstage/commit/dc30fae2d96cb1606d36cc40b242f9b9e539bd70
• https://github.com/backstage/backstage/releases/tag/v1.54.6

Sources