Improper access control in n8n - #VU137161
Published: July 8, 2026
Vulnerability identifier: #VU137161
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-284
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 execute arbitrary code.
The vulnerability exists due to improper access control in the legacy expression evaluator computed-member sanitizer when evaluating crafted expressions. A remote user can create or modify a workflow containing a crafted expression to execute arbitrary code.
The legacy expression engine is the default engine in affected versions.
Remediation
Install security update from vendor's website.