Backstage has improper input validation in scaffolder task list ordering
Impact
An authenticated Backstage user with permission to create and read relevant scaffolder tasks may be able to infer confidential task data under specific conditions. Successful exploitation requires retained task secrets, visibility of a target task, knowledge of the secret structure, and repeated requests.
Patches
Patched in @backstage/plugin-scaffolder-backend version 4.1.0
Workarounds
- At the gateway or reverse proxy, reject task-list requests that specify custom ordering, or allow ordering only by
created_at,status, andcreated_by. - Restrict scaffolder task creation and task read permissions to trusted users, preferably using owner-based task-read conditions.
- Disabling task recovery can reduce secret retention after a task is claimed, but it does not protect secrets in queued tasks and should not be treated as complete mitigation.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @backstage/plugin-scaffolder-backend | < 4.1.0 | 4.1.0 |
References
- https://github.com/backstage/backstage/security/advisories/GHSA-vwp5-f99x-x3rq
- https://nvd.nist.gov/vuln/detail/CVE-2026-106506
- https://github.com/backstage/backstage/commit/e673a869449874a9169e8f89852e75e862011b93
- https://github.com/backstage/backstage
- https://github.com/backstage/backstage/releases/tag/v1.54.6
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-202, CWE-203- Platform
- npm
- Package
@backstage/plugin-scaffolder-backend- Disclosed
- 07.10.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-vwp5-f99x-x3rq - CC BY 4.0
Vulnerability history: @backstage/plugin-scaffolder-backend
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 17
- First → latest
- 10.2021 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 6
- Medium 8
- Low 2
Disclosures per year
- 2021: 3
- 2022: 0
- 2023: 1
- 2024: 0
- 2025: 1
- 2026: 12
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Backstage has improper input validation in scaffolder task list ordering this entry
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