---
cve: "CVE-2026-77072"
severity: "HIGH"
cvss: 8.4
epss: "0.3%"
vendor: "n8n-io"
kev: false
exploited: false
published: "2026-08-20 12:16:38"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-03T06:57:40+02:00"
---

# CVE-2026-77072

> 8.4 HIGH · 🧪 PoC

## Beschreibung

n8n before 1.123.69, 2.33.4, and 2.34.1 contains a stored cross-site scripting vulnerability in the Form node's completion page. The completion page applied its sandboxing Content-Security-Policy only when respondWith was not set to 'redirect', but responseText was always rendered as raw HTML. An authenticated member could set respondWith to 'redirect' via an expression while keeping responseText populated, causing the completion page to serve unsanitized HTML and script from the n8n origin. Any visitor who submitted the resulting public form would have that script execute same-origin with their session.

## CISA-Anreicherung (vulnrichment/ADP)

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

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 430e6e597ab43d2326aa11cd30fcf633766fca31 (Commit)
- 14c9aef0552fb4776501ca1c4589451891dd0ef4 (Commit)

## BSI-Hinweise (deutsch)

- [n8n: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-2681) — _BSI-Einstufung: hoch_
  Ein Angreifer kann mehrere Schwachstellen in n8n ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, Daten zu manipulieren, Cross-Site-Scripting oder Server-Side Request Forgery durchzuführen oder einen Denial-of-Service-Zustand herbeizuführen.

## Referenzen

- <https://github.com/n8n-io/n8n/security/advisories/GHSA-rmr5-775f-jvm2>
- <https://www.vulncheck.com/advisories/n8n-before-stored-xss-via-form-completion-page>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-77072) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_