Improper Authentication in n8n - CVE-2026-33665
Published: April 30, 2026
Vulnerability identifier: #VU128728
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-33665
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: n8n
Affected software:
n8n
n8n
Detailed vulnerability description
The vulnerability allows a remote user to gain full access to another user's account.
The vulnerability exists due to improper authentication in LDAP account linking when matching an LDAP identity to an existing local account by email during login. A remote user can set their own LDAP email attribute to match another user's email and log in to gain full access to another user's account.
LDAP authentication must be configured and active, and the account linkage persists even if the LDAP email attribute is later reverted.
How to mitigate CVE-2026-33665
Install security update from vendor's website.