---
cve: "CVE-2026-103249"
severity: "MEDIUM"
cvss: 6.9
epss: ""
vendor: "n8n-io"
kev: false
exploited: false
published: "2026-10-01 11:17:18"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-03T22:33:33+02:00"
---

# CVE-2026-103249

> 6.9 MEDIUM · 🧪 PoC

## Beschreibung

n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 contain a stored DOM cross-site scripting vulnerability in Resource Locator parameter dropdown link handling. Workflow authors can inject malicious script URLs that execute arbitrary JavaScript in the editor origin when other users open the node dropdown and click the external-link icon, with the payload persisting across workflow imports and shares.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-10-01 15:03:30
- CNA-CVSS: **6.9** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:L/SI:L/SA:N`)

## CISA-Anreicherung (vulnrichment/ADP)

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

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:L/VA:N/SC:L/SI:L/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |

## Patch verfügbar (OSV)

- 108c7163f89b0dfdb149c0b596f896dce257a7fa (Commit)
- c6a01e289540971c4d0bfd8b91ee6f8438d66394 (Commit)

## BSI-Hinweise (deutsch)

- [n8n: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-3393) — _BSI-Einstufung: hoch_
  Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in n8n ausnutzen, um Sicherheitsmaßnahmen zu umgehen, Daten offenzulegen oder zu manipulieren oder Code auszuführen.

## Referenzen

- <https://github.com/n8n-io/n8n/security/advisories/GHSA-c2wp-6fgc-xjq4>
- <https://www.vulncheck.com/advisories/n8n-before-1.123.80-2.39.6-and-2.40.1-stored-dom-xss-via-resource-locator>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-103249) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_