CVE-2026-56348

Critical

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.

SeverityCritical

CVSS9.1

Exploit probability—

Product

N8n

PublishedJun 22, 2026

First seenJun 22, 2026

Weakness typeCWE-918Server-side request forgery (SSRF)

How to fix

Update

n8n n8n2.20.0 or later
n8n2.20.0 or later

Vendor advisories

github.com/n8n-io/n8n/security/advisories/GHSA-3875-8gcx-7v46

Affected products

Product	Affected versions	Fixed in
n8n n8n	v < 2.20.0	2.20.0
n8nnpm	v < 2.20.0	2.20.0

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