CVE-2026-33665 n8n: LDAP Email-Based Account Linking Allows Privilege Escalation and Account Takeover
Authenticated LDAP users can take over other accounts, including admins, by matching email attributes, requiring LDAP configuration.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33665?
CVE-2026-33665 is a high-severity authentication bypass vulnerability in N8n N8n, published on 25 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-287
Which versions are affected by CVE-2026-33665?
4 open source packages ship an affected version, including n8n. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
n8n npm | All versions | 1.121.0 |
n8n npm | All versions | 1.121.0 |
n8n npm | From 2.0.0-rc.0 | 2.4.0 |
n8n npm | From 2.0.0-rc.0 | 2.4.0 |
Products include N8n N8n.
How do I fix CVE-2026-33665?
Upgrade n8n to a fixed version for your release line: 1.121.0 or 2.4.0.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-33665 being exploited?
There is no known exploitation of CVE-2026-33665 in the wild and no public exploit code.
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- CVE-2026-1470 n8n Unsafe Workflow Expression Evaluation Allows Remote Code Execution
- CVE-2025-68668 n8n Vulnerable to Arbitrary Command Execution in Pyodide based Python Code Node
Sources
Also known as GHSA-c545-x2rh-82fc.