Improper access control in n8n - #VU127218
Published: April 23, 2026
Vulnerability identifier: #VU127218
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/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 attacker to disclose sensitive information and influence downstream workflow behavior.
The vulnerability exists due to improper access control in the /chat WebSocket endpoint used by the Chat Trigger node's Hosted Chat feature when handling connections to a target execution. A remote attacker can connect to a waiting execution using a valid execution ID to disclose sensitive information and influence downstream workflow behavior.
Exploitation requires a public Hosted Chat workflow with authentication set to none, a target execution in a waiting state, and knowledge of the execution ID for that waiting execution.
Remediation
Install security update from vendor's website.