CVE-2026-56348

CRITICAL

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

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-3875-8gcx-7v46)
https://github.com/n8n-io/n8n/security/advisories/GHSA-3875-8gcx-7v46
Third Party Advisory third-party-advisory
VulnCheck Advisory: n8n - Credential Exfiltration via Allowed HTTP Request Domains Bypass in Dynamic Node Parameters Endpoint
https://www.vulncheck.com/advisories/n8n-credential-exfiltration-via-allowed-http-request-domains-bypass-in-dynamic-node-parameters-endpoint

Scores

CVSS v3 9.1
EPSS 0.0026
EPSS Percentile 17.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-918
Status published
Products (3)
n8n/n8n < 2.20.0 (3 CPE variants)
n8n/n8n 2.20.0
npm/n8n 0 - 2.20.0npm
Published Jun 22, 2026
Tracked Since Jun 23, 2026