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CVE-2026-42230— n8n: Open Redirect in MCP OAuth Consent Flow

Quick assessment

Affected
n8n-io n8n
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

n8n是n8n开源的一个可扩展的工作流自动化工具。 n8n 1.123.32之前版本、2.17.4之前版本和2.18.1之前版本存在输入验证错误漏洞，该漏洞源于/mcp-oauth/register端点接受未经身份验证的OAuth客户端注册且允许任意redirect_uri值，可能导致用户拒绝MCP OAuth同意对话框时被重定向至攻击者控制的URL，实现开放重定向。

AI Predicted 5.4 Difficulty: Easy EPSS 0.29% · P20

Affected Version Matrix 3

VendorProduct Version RangeStatus
n8n-io n8n < 1.123.32 affected
>= 2.17.0, < 2.17.4 affected
>= 2.18.0, < 2.18.1 affected
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I. Basic Information for CVE-2026-42230

Vulnerability Information
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Vulnerability Title
n8n: Open Redirect in MCP OAuth Consent Flow
Source: CVE Program / CVE List V5
Vulnerability Description
n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, the /mcp-oauth/register endpoint accepted OAuth client registrations without authentication, allowing arbitrary redirect_uri values to be registered. When a user denies the MCP OAuth consent dialog, the handleDeny handler redirects the user to the registered redirect_uri without validation, enabling an open redirect to an attacker-controlled URL. An attacker can craft a phishing link and send it to a victim; if the victim clicks "Deny" on the consent page, they are silently redirected to an external site. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
n8n是n8n开源的一个可扩展的工作流自动化工具。 n8n 1.123.32之前版本、2.17.4之前版本和2.18.1之前版本存在输入验证错误漏洞，该漏洞源于/mcp-oauth/register端点接受未经身份验证的OAuth客户端注册且允许任意redirect_uri值，可能导致用户拒绝MCP OAuth同意对话框时被重定向至攻击者控制的URL，实现开放重定向。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
n8n-io n8n < 1.123.32 -

II. Public POCs for CVE-2026-42230

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III. Intelligence Information for CVE-2026-42230

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Vendor Advisories for CVE-2026-42230 (1)

Same Patch Batch · n8n-io · 2026-05-04 · 12 CVEs total

CVE-2026-42232 n8n: XML Node Prototype Pollution to RCE
CVE-2026-42233 n8n: SQL Injection in Oracle Database Node via Limit Field
CVE-2026-42229 n8n: SQL Injection in SeaTable Node
CVE-2026-42228 n8n: Hijacking of Unauthenticated Chat Execution
CVE-2026-42235 n8n: XSS via MCP OAuth client
CVE-2026-42236 n8n: Unauthenticated Denial of Service via MCP Client Registration
CVE-2026-42237 n8n: SQL Injection in Snowflake and MySQL Nodes
CVE-2026-42226 n8n: Credential Authorization Bypass in dynamic-node-parameters Allows Foreign API Key Rep
CVE-2026-42234 n8n: Python Task Runner Sandbox Escape
CVE-2026-42227 n8n: Public API Variables IDOR Allows Cross-Project Secret Disclosure
CVE-2026-42231 n8n: Prototype Pollution in XML Webhook Body Parser Leads to RCE

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-601

V. Comments for CVE-2026-42230

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