Information disclosure in @Backstage Plugin-Scaffolder-Backend
CVE-2026-106504
Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder task logs. An authenticated user who can create and read scaffolder tasks may be able to observe sensitive values in task logs in deployments with restrictive action permissions and affected templates. Exploitation requires a denied action whose input contains such a value. This issue is fixed in version 4.1.0.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- @Backstage Plugin-Scaffolder-Backend — versions < 4.1.0
- Backstage — versions < 1.54.6
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-106504?
- CVE-2026-106504 is a medium-severity vulnerability in @Backstage Plugin-Scaffolder-Backend, classified under Insertion of Sensitive Information into Log File. CVSS score: 6.5/10. Published 2026-10-06.
- How severe is CVE-2026-106504?
- Medium severity. CVSS v3 base score is 6.5 out of 10.