Vulnerability · Published Aug 20, 2026 · Assigned by VulnCheck

CVE-2026-77072n8n before 1.123.69 Stored XSS via Form Completion Page

High 8.4

In plain English

A high-severity cross-site scripting in n8n from n8n-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).

Severity (CVSS 4.0)8.4High

Exploit odds (30 days)0.3%top 76.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
n8n-io	n8n	0 – before 1.123.69
n8n-io	n8n	2.34.0 – before 2.34.1
n8n-io	n8n	2.0.0 – before 2.33.4

Weakness: CWE-79 · Vector: 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

References

GitHub Security Advisory (GHSA-rmr5-775f-jvm2) vendor-advisory
VulnCheck Advisory: n8n before 1.123.69 Stored XSS via Form Completion Page third-party-advisory