Backstage: Improper input validation in Sentry scaffolder actions
Impact
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.
Patches
Upgrade @backstage/plugin-scaffolder-backend-module-sentry to version 0.3.8 or later. The fixed package is available in Backstage v1.54.8 and Backstage v1.55.0.
The update removes custom action-level apiBaseUrl values. Move any such value to scaffolder.sentry.apiBaseUrl before upgrading.
Workarounds
- Disable the affected actions until the patched package is deployed.
- Restrict
scaffolder.action.executepermission for the affected Sentry actions to trusted users and templates.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @backstage/plugin-scaffolder-backend-module-sentry | >= 0.3.0, < 0.3.8 | 0.3.8 |
References
- https://github.com/backstage/backstage/security/advisories/GHSA-g734-fhp4-7mfp
- https://nvd.nist.gov/vuln/detail/CVE-2026-106459
- https://github.com/backstage/backstage/commit/b0170fad7962fb8c3d71366b5265cf283c7bbcf7
- https://github.com/backstage/backstage
- https://github.com/backstage/backstage/releases/tag/v1.54.8
- https://github.com/backstage/backstage/releases/tag/v1.55.0
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N- Weakness (CWE)
CWE-200, CWE-918- Platform
- npm
- Package
@backstage/plugin-scaffolder-backend-module-sentry- Disclosed
- 07.10.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-g734-fhp4-7mfp - CC BY 4.0
Vulnerability history: @backstage/plugin-scaffolder-backend-module-sentry
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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