Disclosure summary
### 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](https://github.com/backstage/backstage/releases/tag/v1.54.8) and [Backstage v1.55.0](https://github.com/backstage/backstage/releases/tag/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.execute` permission for the affected Sentry actions to trusted users and templates.
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
GitHub Reviewed Security Advisories · GHSA-g734-fhp4-7mfp
Open original source · Updated Oct 07, 2026
Backstage: Improper input validation in Sentry scaffolder actions
Source severity: HIGH / 0
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| npm | @backstage/plugin-scaffolder-backend-module-sentry | >= 0.3.0, < 0.3.8 | 0.3.8 |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Reviewed advisory
PUBLISHED 2026-10-07T16:25:01-04:00
MODIFIED 2026-10-07T16:25:03-04:00
INGESTED 2026-10-08T12:30:39-04:00