n8n Vulnerable to LDAP Filter Injection in LDAP Node
Medium4.8CVE-2026-33751 · Published Mar 26, 2026
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| n8n npm | < 1.123.27 | 1.123.27 |
| >= 2.14.0, < 2.14.1 | 2.14.1 | |
| >= 2.0.0-rc.0, < 2.13.3 | 2.13.3 |
Details and references
## Impact 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). ## Patches 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. ## Workarounds 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. - 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.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- Severity from
- GitHub (reviewed advisory)
- Weakness
- CWE-90
- Also known as
- CVE-2026-33751
More n8n advisories
All n8n| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Mar 25 | n8n's Source Control SSH Configuration Uses StrictHostKeyChecking=no CVE-2026-33724Medium5.4fixed in 2.5.0 | Medium5.4 | 2.5.0 |
| Mar 25 | n8n Has External Secrets Authorization Bypass in Credential Saving CVE-2026-33722High6.3fixed in 1.123.23, 2.6.4 | High6.3 | 1.123.23, 2.6.4 |
| Mar 25 | n8n Has Authorization Bypass in OAuth Callback via N8N_SKIP_AUTH_ON_OAUTH_CALLBACK CVE-2026-33720Medium4.7fixed in 2.8.0 | Medium4.7 | 2.8.0 |
| Mar 25 | n8n: LDAP Email-Based Account Linking Allows Privilege Escalation and Account Takeover CVE-2026-33665High8.2fixed in 1.121.0, 2.4.0 | High8.2 | 1.121.0, 2.4.0 |
| Mar 25 | n8n is Vulnerable to Credential Theft via Name-Based Resolution and Permission Checker Bypass in Community Edition CVE-2026-33663High9.9fixed in 1.123.27, 2.13.3, 2.14.1 | High9.9 | 1.123.27, 2.13.3, 2.14.1 |
| Mar 25 | n8n has Multiple Remote Code Execution Vulnerabilities in Merge Node AlaSQL SQL Mode CVE-2026-33660Critical9.9fixed in 1.123.27, 2.13.3, 2.14.1 | Critical9.9 | 1.123.27, 2.13.3, 2.14.1 |