CVE-2026-56348 — Vulnerability in n8n — CVE Details

MEDIUM

n8n: Credential exfiltration via Allowed HTTP Request Domains Bypass

Published May 19, 2026Updated July 20, 2026Source: osv

Summary

## Impact The `POST /rest/dynamic-node-parameters/options` endpoint allowed any authenticated user to cause the n8n server to issue HTTP requests including credentials bypassing the intended restrictions on which hosts could be contacted for that credential (Allowed HTTP Request Domains). The user needed to be authenticated and have access to the credential. ## Patches The issue has been fixed in n8n version 2.20.0. Users should upgrade to this version or later to remediate the vulnerability. ## Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Restrict n8n access to fully trusted users only. - Limit credential sharing to users who genuinely require access to those credentials. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Advisory Timeline

First published May 19, 2026 (146 days ago).
Last revised July 20, 2026 — 62 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm

Update n8n to 2.20.0 or later

npm install n8n@2.20.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

Package	Ecosystem	Affected	Fixed In
n8n	npm	All versions	2.20.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-918
Server-Side Request Forgery (SSRF)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

References

Frequently Asked Questions

What is CVE-2026-56348?: n8n: Credential exfiltration via Allowed HTTP Request Domains Bypass This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-56348?: CVE-2026-56348 affects n8n. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-56348 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-3875-8gcx-7v46

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