CVE-2026-106459
Backstage: Improper input validation in Sentry scaffolder actions
CVSS Score
8.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-200 CWE-918 |
| Vendor | backstage |
| Product | backstage |
| Published | Oct 6, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None
Affected Versions
backstage / backstage
>= 1.47.0, < 1.54.8
@backstage / plugin-scaffolder-backend-module-sentry
>= 0.3.0, < 0.3.8
References
github.com: https://github.com/backstage/backstage/security/advisories/GHSA-g734-fhp4-7mfp github.com: https://github.com/backstage/backstage/commit/b0170fad7962fb8c3d71366b5265cf283c7bbcf7 github.com: https://github.com/backstage/backstage/releases/tag/v1.54.8 github.com: https://github.com/backstage/backstage/releases/tag/v1.55.0