SSRF in @Backstage Plugin-Scaffolder-Backend-Module-Sentry
CVE-2026-106459
Backstage is an open framework for building developer portals. From 0.3.0 until 0.3.8, the @backstage/plugin-scaffolder-backend-module-sentry package is affected by improper input validation in sentry scaffolder actions. An authenticated internal user who can execute the affected actions may cause the backend to contact unintended destinations and disclose Sentry integration credentials. Subsequent impact depends on network reachability and the privileges granted to the configured token. This issue is fixed in version 0.3.8.
Vulnerability class: Information Disclosure
Published .
CVSS v3 metric
CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/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-Module-Sentry — versions >= 0.3.0, < 0.3.8
- Backstage — versions >= 1.47.0, < 1.54.8
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-106459?
- CVE-2026-106459 is a high-severity vulnerability in @Backstage Plugin-Scaffolder-Backend-Module-Sentry, classified under Information Disclosure. CVSS score: 8.5/10. Published 2026-10-06.
- How severe is CVE-2026-106459?
- High severity. CVSS v3 base score is 8.5 out of 10.