Improper access control in n8n - CVE-2026-42228
Published: April 23, 2026
Vulnerability identifier: #VU127218
CSH Severity: Medium
CVSS v4: 6.3 [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]
CVE-ID: CVE-2026-42228
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
n8n
How to mitigate CVE-2026-42228
Install security update from vendor's website.
n8n - addressed in versions 1.123.32, 2.17.4, 2.18.1