n8n-io n8n up to 1.123.31/2.17.3/2.18.0 WebSocket Endpoint /chat authorization

Summaryinfo

A vulnerability has been found in n8n-io n8n up to 1.123.31/2.17.3/2.18.0 and classified as critical. This impacts an unknown function of the file /chat of the component WebSocket Endpoint. The manipulation leads to authorization. This vulnerability is uniquely identified as CVE-2026-42228. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in n8n-io n8n up to 1.123.31/2.17.3/2.18.0. It has been rated as critical. This issue affects an unknown part of the file /chat of the component WebSocket Endpoint. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, the /chat WebSocket endpoint used by the Chat Trigger node's Hosted Chat feature did not verify that an incoming connection was authorized to interact with the target execution. An unauthenticated remote attacker who could identify a valid execution ID for a workflow in a waiting state could attach to that execution, receive the pending prompt intended for the legitimate user, and submit arbitrary input to resume or influence downstream workflow behavior. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-42228 since 04/25/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.123.32, 2.17.4 or 2.18.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-27096) and CERT Bund (WID-SEC-2026-1251). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• n8n n8n

Productinfo

Vendor

• n8n-io

Name

• n8n

Version

• 1.123.0
• 1.123.1
• 1.123.2
• 1.123.3
• 1.123.4
• 1.123.5
• 1.123.6
• 1.123.7
• 1.123.8
• 1.123.9
• 1.123.10
• 1.123.11
• 1.123.12
• 1.123.13
• 1.123.14
• 1.123.15
• 1.123.16
• 1.123.17
• 1.123.18
• 1.123.19
• 1.123.20
• 1.123.21
• 1.123.22
• 1.123.23
• 1.123.24
• 1.123.25
• 1.123.26
• 1.123.27
• 1.123.28
• 1.123.29
• 1.123.30
• 1.123.31
• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.17.0
• 2.17.1
• 2.17.2
• 2.17.3
• 2.18.0

Website

• Product: https://github.com/n8n-io/n8n/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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