Vulnerability · Published Jun 22, 2026 · Assigned by VulnCheck

CVE-2026-56348n8n - Credential Exfiltration via Allowed HTTP Request Domains Bypass in Dynamic Node Parameters Endpoint

Critical 9.1

In plain English

A critical-severity server-side request forgery in n8n from n8n. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)0.5%top 58.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

n8n before 2.20.0 contains a credential exfiltration vulnerability in the POST /rest/dynamic-node-parameters/options endpoint that allows authenticated users to bypass Allowed HTTP Request Domains restrictions. Attackers with credential access can cause the n8n server to issue HTTP requests with credentials to unauthorized hosts, exfiltrating sensitive authentication data.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	n8n	2.20.0	GHSA-3875-8gcx-7v46

Affected products (as reported)

Vendor	Product	Versions
n8n	n8n	0 – before 2.20.0

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

References

GitHub Security Advisory (GHSA-3875-8gcx-7v46) vendor-advisory
VulnCheck Advisory: n8n - Credential Exfiltration via Allowed HTTP Request Domains Bypass in Dynamic Node Parameters Endpoint third-party-advisory