CVE-2026-33749— n8n Vulnerable to XSS via Binary Data Inline HTML Rendering
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 1.123.27之前版本、2.13.3之前版本和2.14.1之前版本存在跨站脚本漏洞，该漏洞源于二进制数据端点响应头缺失，可能导致跨站脚本攻击。
Possible ATT&CK Techniques 3 AI
T1530 · Data from Cloud Storage T1059 · Command and Scripting Interpreter T1078 · Valid Accounts
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I. Basic Information for CVE-2026-33749
Vulnerability Information
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Vulnerability Title
n8n Vulnerable to XSS via Binary Data Inline HTML Rendering
Source: CVE Program / CVE List V5
Vulnerability Description
n8n is an open source workflow automation platform. Prior to versions 1.123.27, 2.13.3, and 2.14.1, an authenticated user with permission to create or modify workflows could craft a workflow that produces an HTML binary data object without a filename. The `/rest/binary-data` endpoint served such responses inline on the n8n origin without `Content-Disposition` or `Content-Security-Policy` headers, allowing the HTML to render in the browser with full same-origin JavaScript access. By sending the resulting URL to a higher-privileged user, an attacker could execute JavaScript in the victim's authenticated session, enabling exfiltration of workflows and credentials, modification of workflows, or privilege escalation to admin. The issue has been fixed in n8n versions 1.123.27, 2.13.3, and 2.14.1. Users should upgrade to one of these versions or later to remediate the vulnerability. If upgrading is not immediately possible, administrators should consider the following temporary mitigations: Limit workflow creation and editing permissions to fully trusted users only, and/or restrict network access to the n8n instance to prevent untrusted users from accessing binary data URLs. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
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 1.123.27之前版本、2.13.3之前版本和2.14.1之前版本存在跨站脚本漏洞，该漏洞源于二进制数据端点响应头缺失，可能导致跨站脚本攻击。
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
II. Public POCs for CVE-2026-33749
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-33749 (1)
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XSS via Binary Data Inline HTML Rendering · Advisory · n8n-io/n8n · GitHub x_refsource_CONFIRM
Same Patch Batch · n8n-io · 2026-03-25 · 11 CVEs total
| CVE-2026-27496 | n8n has In-Process Memory Disclosure in its Task Runner | |
| CVE-2026-33660 | n8n Has Multiple Remote Code Execution Vulnerabilities in Merge Node AlaSQL SQL Mode | |
| CVE-2026-33663 | n8n Vulnerable to Credential Theft via Name-Based Resolution and Permission Checker Bypass | |
| CVE-2026-33665 | n8n: LDAP Email-Based Account Linking Allows Privilege Escalation and Account Takeover | |
| CVE-2026-33696 | n8n Vulnerable to Prototype Pollution in XML & GSuiteAdmin node parameters lead to RCE | |
| CVE-2026-33713 | n8n Vulnerable to SQL Injection in Data Table Node via orderByColumn Expression | |
| CVE-2026-33722 | n8n Has External Secrets Authorization Bypass in Credential Saving | |
| CVE-2026-33720 | n8n Has Authorization Bypass in OAuth Callback via N8N_SKIP_AUTH_ON_OAUTH_CALLBACK | |
| CVE-2026-33724 | n8n's Source Control SSH Configuration Uses StrictHostKeyChecking=no | |
| CVE-2026-33751 | n8n Vulnerable to LDAP Filter Injection in LDAP Node |
IV. Related Vulnerabilities
Same product: n8n
-
CVE-2026-110853
n8n before 1.123.83 Authorization Bypass via Execute Sub-wor -
CVE-2026-110852
n8n before 1.123.83, 2.41.4, and 2.42.1 Unauthenticated Work -
CVE-2026-110851
n8n before 2.41.4 and 2.42.1 Cross-Project Agent Ownership T -
CVE-2026-110850
n8n before 2.41.4 and 2.42.1 Credential Check Bypass via Age -
CVE-2026-110849
n8n before 1.123.83, 2.41.4, and 2.42.1 Stored XSS via Binar
Same vendor: n8n-io
-
CVE-2026-110853
n8n before 1.123.83 Authorization Bypass via Execute Sub-wor -
CVE-2026-110852
n8n before 1.123.83, 2.41.4, and 2.42.1 Unauthenticated Work -
CVE-2026-110851
n8n before 2.41.4 and 2.42.1 Cross-Project Agent Ownership T -
CVE-2026-110850
n8n before 2.41.4 and 2.42.1 Credential Check Bypass via Age -
CVE-2026-110849
n8n before 1.123.83, 2.41.4, and 2.42.1 Stored XSS via Binar
Same weakness: CWE-79
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V. Comments for CVE-2026-33749
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