Information disclosure in @Backstage Plugin-Scaffolder-Backend
CVE-2026-106501
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.
Vulnerability class: Information Disclosure
Published .
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/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 < 3.3.1, >= 3.4.0, < 3.4.1, >= 4.0.0, < 4.0.3
- Backstage — versions < 1.49.6, >= 1.50.0-next.0, < 1.50.5, >= 1.51.0-next.0, < 1.54.6
Weakness classification (CWE)
References
- github.com/backstage/backstage/security/advisories/GHSA-g2v8-7jhw-pp8p
- github.com/backstage/backstage/commit/66d2219edf0abe33ab7d0c1ced5d069d1e065be5
- github.com/backstage/backstage/commit/c19838870476a8e29144c84b1a5ac0654ec20fb5
- github.com/backstage/backstage/commit/e262d649981ff99bb01ca7077807ae3e25e85560
- github.com/backstage/backstage/releases/tag/v1.49.6
- github.com/backstage/backstage/releases/tag/v1.50.5
- github.com/backstage/backstage/releases/tag/v1.54.6
Frequently asked questions
- What is CVE-2026-106501?
- CVE-2026-106501 is a critical-severity vulnerability in @Backstage Plugin-Scaffolder-Backend, classified under Information Disclosure. CVSS score: 9.6/10. Published 2026-10-06.
- How severe is CVE-2026-106501?
- Critical severity. CVSS v3 base score is 9.6 out of 10.