| Component | n8n |
| Severity | high (CVSS 7.6) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N |
| Published (NVD) | 2026-08-20 |
| Last modified | 2026-09-01 |
| Affected versions | n8n < 1.123.69 n8n >= 2.33.0, < 2.33.4 n8n = 2.34.0 |
| Fixed in | 1.123.69, 2.33.4 |
| Weakness | CWE-79 |
| CISA KEV | not listed |
NVD description
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.
What to do
- Upgrade n8n to
1.123.69or later (or the patched release of your branch: 2.33.4). - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-77072
- 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
Read more
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