EUVD-2026-15944
GHSA-c545-x2rh-82fc
CVSS Vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
5Description
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.
Analysis
Authenticated n8n users can hijack administrator accounts when LDAP authentication is enabled by manipulating their LDAP email attribute to match a target account's email address, gaining full access that persists even after reverting the email change. This authentication bypass (CWE-287) affects n8n versions prior to 2.4.0 and 1.121.0 where LDAP is configured, and public exploit code exists. …
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Remediation
Within 24 hours: Audit LDAP user account email modification permissions and restrict non-administrators from changing their email attributes at the directory level; document all n8n administrator accounts. Within 7 days: Implement compensating controls (disable LDAP auto-linking, enforce manual account linkage, or isolate n8n behind additional authentication layers); conduct access review of all linked LDAP accounts for unauthorized changes. …
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External POC / Exploit Code
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