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CVE-2026-33751— n8n Vulnerable to LDAP Filter Injection in LDAP Node

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之前版本存在注入漏洞，该漏洞源于LDAP节点过滤器转义逻辑存在缺陷，可能导致攻击者操纵过滤器以检索非预期的LDAP记录或绕过身份验证检查。

AI Predicted 6.5 Difficulty: Easy EPSS 0.31% · P21
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I. Basic Information for CVE-2026-33751

Vulnerability Information
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Vulnerability Title
n8n Vulnerable to LDAP Filter Injection in LDAP Node
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, a flaw in the LDAP node's filter escape logic allowed LDAP metacharacters to pass through unescaped when user-controlled input was interpolated into LDAP search filters. In workflows where external user input is passed via expressions into the LDAP node's search parameters, an attacker could manipulate the constructed filter to retrieve unintended LDAP records or bypass authentication checks implemented in the workflow. Exploitation requires a specific workflow configuration. The LDAP node must be used with user-controlled input passed via expressions (e.g., from a form or webhook). 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, disable the LDAP node by adding `n8n-nodes-base.ldap` to the `NODES_EXCLUDE` environment variable, and/or avoid passing unvalidated external user input into LDAP node search parameters via expressions. 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:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
LDAP查询中使用的特殊元素转义处理不恰当(LDAP注入)
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 注入漏洞
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之前版本存在注入漏洞，该漏洞源于LDAP节点过滤器转义逻辑存在缺陷，可能导致攻击者操纵过滤器以检索非预期的LDAP记录或绕过身份验证检查。
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 < 1.123.27 -

II. Public POCs for CVE-2026-33751

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III. Intelligence Information for CVE-2026-33751

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Vendor Advisories for CVE-2026-33751 (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-2026-33665 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-2026-33749 n8n Vulnerable to XSS via Binary Data Inline HTML Rendering

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-90

V. Comments for CVE-2026-33751

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