---
cve: "CVE-2026-106500"
severity: "HIGH"
cvss: 8.5
epss: "0.3%"
vendor: "@backstage"
kev: false
exploited: false
published: "2026-10-06 22:17:05"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-08T12:23:30+02:00"
---

# CVE-2026-106500

> 8.5 HIGH · 🧪 PoC

## Beschreibung

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.

## CNA-Record (Kanon, cvelistV5)

- CNA: **GitHub_M**
- State: PUBLISHED
- Stand: 2026-10-07 15:48:01
- CNA-CVSS: **8.5** (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- e8c20440640d1d2baffbf6e44a71e6960e5eb2ec (Commit)
- f3e982bd0530f51760c8a70d21eafaa7aed2e6eb (Commit)

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-106500/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_