CVE-2026-106500
Backstage: Improper task state validation in Scaffolder backend
HIGH 8.5
At a glance
- Source
- NVD
- EPSS
- EPSS 0.34 % · percentile 27 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
Description
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by improper task state validation in scaffolder backend. An authenticated user with permission to create and access Scaffolder tasks may, under specific timing and deployment conditions, affect files accessible to the Backstage backend. If backend application files are writable, the confidentiality, integrity, and availability of the backend may be compromised. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.
Weaknesses (CWE)
References
- https://github.com/backstage/backstage/security/advisories/GHSA-xvgh-hmx8-9xxf
- https://github.com/backstage/backstage/commit/0d24f1b8701f3dde6cd597f81997c1ea873a43ae
- https://github.com/backstage/backstage/commit/56be299dd3ef6706e13e76ea2f8a9b0dd0b6413d
- https://github.com/backstage/backstage/commit/9e86c95a1a3ddfd54db03731cd8678aa63495175
- https://github.com/backstage/backstage/releases/tag/v1.49.6
- https://github.com/backstage/backstage/releases/tag/v1.50.5
- https://github.com/backstage/backstage/releases/tag/v1.54.6
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H | GitHub_M |
| CVSS 3.1 | HIGH 8.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-xvgh-hmx8-9xxf — Backstage: Improper task state validation in Scaffolder backend
European references
- ENISA EUVD · EUVD-2026-94058
- GCVE · GCVE-0-2026-106500
Affected configurations (NVD CPE)
cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*< 3.3.1cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*≥ 3.4.0 < 3.4.1cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*≥ 4.0.0 < 4.0.3cpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend:*:*:*:*:*:*:*:*≥ 4.0.4 < 4.1.0cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*< 1.49.6cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*≥ 1.50.0 < 1.50.5cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*≥ 1.51.0 < 1.54.6
Affected products
| Product | Versions |
|---|---|
| backstage · backstage | affected < 1.49.6 ; affected >= 1.50.0-next.0, < 1.50.5 ; affected >= 1.51.0-next.0, < 1.54.6 |
| @backstage · plugin-scaffolder-backend | affected < 3.3.1 ; affected >= 3.4.0, < 3.4.1 ; affected >= 4.0.0, < 4.0.3 ; affected >= 4.0.4, < 4.1.0 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |