CVE-2026-126389: n8n before 1.123.89 Authentication Bypass via Chat Trigger Embedded Chat
n8n before 1.123.89 contains an authentication bypass vulnerability in the Chat Trigger that allows unauthenticated attackers to skip n8n User Auth through the setup GET webhook route in embedded chat mode. Attackers can send unauthenticated GET requests to the chat webhook URL to read named session conversation history or trigger workflows with attacker-supplied input.
Affected Software
Event History
Frequently Asked Questions
Which deployments are exposed to this issue?
n8n versions before 1.123.89 are affected when the Chat Trigger is used in embedded chat mode and the setup GET webhook route is reachable. The issue concerns bypassing n8n User Auth through the chat webhook URL.
What does an attacker need to exploit it?
An attacker does not need authentication or user interaction, but must be able to send a GET request to the relevant chat webhook URL. Exploitation can involve a named session to read its conversation history or attacker-supplied input to trigger workflows.
What can be done if upgrading is not immediately possible?
The provided information does not specify a vendor workaround. Reducing or blocking unauthenticated access to affected Chat Trigger setup GET webhook routes, particularly for embedded chat deployments, can limit exposure until an upgrade is possible.