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CVE-2026-42235— n8n: XSS via MCP OAuth client

EPSS 0.08% · P23
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I. Basic Information for CVE-2026-42235

Vulnerability Information
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Vulnerability Title
n8n: XSS via MCP OAuth client
Source: NVD (National Vulnerability Database)
Vulnerability Description
n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, an unauthenticated attacker could register a malicious MCP OAuth client with a crafted client_name. If a victim user authorized the OAuth consent dialog and a second user subsequently revoked that access, a toast notification would render the injected script. Clicking the link would execute arbitrary JavaScript in the victim's authenticated n8n browser session, enabling credential and session token theft, workflow manipulation, or privilege escalation. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
替代XSS语法转义处理不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
n8n 跨站脚本漏洞
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之前版本存在跨站脚本漏洞，该漏洞源于未经身份验证的攻击者可注册恶意MCP OAuth客户端并包含特制client_name，可能导致受害者用户授权后第二个用户撤销访问时渲染注入脚本，点击链接执行任意JavaScript，实现凭据和会话令牌窃取、工作流操纵或权限提升。
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

VendorProductAffected VersionsCPESubscribe
n8n-ion8n < 1.123.32 -

II. Public POCs for CVE-2026-42235

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III. Intelligence Information for CVE-2026-42235

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

CVE-2026-42232n8n: XML Node Prototype Pollution to RCE
CVE-2026-42233n8n: SQL Injection in Oracle Database Node via Limit Field
CVE-2026-42229n8n: SQL Injection in SeaTable Node
CVE-2026-42228n8n: Hijacking of Unauthenticated Chat Execution
CVE-2026-42236n8n: Unauthenticated Denial of Service via MCP Client Registration
CVE-2026-42237n8n: SQL Injection in Snowflake and MySQL Nodes
CVE-2026-42226n8n: Credential Authorization Bypass in dynamic-node-parameters Allows Foreign API Key Rep
CVE-2026-42230n8n: Open Redirect in MCP OAuth Consent Flow
CVE-2026-42234n8n: Python Task Runner Sandbox Escape
CVE-2026-42227n8n: Public API Variables IDOR Allows Cross-Project Secret Disclosure
CVE-2026-42231n8n: Prototype Pollution in XML Webhook Body Parser Leads to RCE

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-87

V. Comments for CVE-2026-42235

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