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CVE-2026-33665— n8n: LDAP Email-Based Account Linking Allows Privilege Escalation and Account Takeover

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 2.4.0之前版本和1.121.0之前版本存在授权问题漏洞，该漏洞源于LDAP身份自动链接机制，可能导致账户接管。

AI Predicted 9.8 Difficulty: Easy EPSS 0.45% · P37
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I. Basic Information for CVE-2026-33665

Vulnerability Information
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Vulnerability Title
n8n: LDAP Email-Based Account Linking Allows Privilege Escalation and Account Takeover
Source: CVE Program / CVE List V5
Vulnerability Description
n8n is an open source workflow automation platform. Prior to versions 2.4.0 and 1.121.0, when LDAP authentication is enabled, n8n automatically linked an LDAP identity to an existing local account if the LDAP email attribute matched the local account's email. An authenticated LDAP user who could control their own LDAP email attribute could set it to match another user's email — including an administrator's — and upon login gain full access to that account. The account linkage persisted even if the LDAP email was later reverted, resulting in a permanent account takeover. LDAP authentication must be configured and active (non-default). The issue has been fixed in n8n versions 2.4.0 and 1.121.0. 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: Disable LDAP authentication until the instance can be upgraded, restrict LDAP directory permissions so that users cannot modify their own email attributes, and/or audit existing LDAP-linked accounts for unexpected account associations. 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:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 授权问题漏洞
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 2.4.0之前版本和1.121.0之前版本存在授权问题漏洞，该漏洞源于LDAP身份自动链接机制，可能导致账户接管。
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 < 1.121.0 -

II. Public POCs for CVE-2026-33665

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III. Intelligence Information for CVE-2026-33665

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Vendor Advisories for CVE-2026-33665 (1)

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-2026-33696 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-2026-33749 n8n Vulnerable to XSS via Binary Data Inline HTML Rendering
CVE-2026-33751 n8n Vulnerable to LDAP Filter Injection in LDAP Node

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-287

V. Comments for CVE-2026-33665

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