Missing Authorization Affecting n8n package, versions <1.123.32>=2.0.0-rc.0 <2.17.4>=2.18.0 <2.18.1
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- published3 May 2026
- disclosed29 Apr 2026
- credit34selen
Introduced: 29 Apr 2026
NewCVE-2026-42228 (opens in a new tab)How to fix?
Upgrade n8n to version 1.123.32, 2.17.4, 2.18.1 or higher.
Overview
n8n is a n8n Workflow Automation Tool
Affected versions of this package are vulnerable to Missing Authorization via the /chat WebSocket endpoint when authentication is set to None and a workflow execution is in a waiting state. An attacker can gain unauthorized access to workflow executions and influence downstream workflow behavior by attaching to an execution using a discovered execution ID and submitting arbitrary input.
Note: This is only exploitable if the Hosted Chat workflow is publicly exposed with authentication set to None, a target execution is in a waiting state, and the attacker can obtain the execution ID.
Workaround
This vulnerability can be mitigated by enabling authentication on all Chat Trigger nodes by setting the Authentication field to n8n User Auth rather than None.