Improper access control in n8n - #VU135226
Published: June 25, 2026
Vulnerability identifier: #VU135226
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
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 disclose sensitive information.
The vulnerability exists due to improper access control in the AI Agents MCP connector when processing agent requests to arbitrary URLs. A remote user can point an MCP tool at an external server they control and run the agent to disclose sensitive information.
Only instances with the AI Agents module enabled and a shared credential with domain restrictions are vulnerable.
Remediation
Install security update from vendor's website.