CVE-2026-42228: CWE-862: Missing Authorization in n8n-io n8n
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.
AI Analysis
Technical Summary
The vulnerability CVE-2026-42228 in n8n-io's n8n product is due to missing authorization on the /chat WebSocket endpoint used by the Chat Trigger node's Hosted Chat feature. Before versions 1.123.32, 2.17.4, and 2.18.1, the endpoint did not verify if an incoming connection was authorized to interact with the target workflow execution. This allowed unauthenticated remote attackers who could identify a valid execution ID to attach to the workflow execution, receive prompts intended for legitimate users, and submit arbitrary inputs to affect workflow behavior. The issue is fixed in the mentioned versions.
Potential Impact
An unauthenticated remote attacker with knowledge of a valid execution ID can interfere with workflow executions by intercepting prompts and injecting arbitrary inputs. This can lead to unauthorized manipulation of workflow behavior, potentially disrupting automated processes or causing unintended actions within the affected n8n instances. The vulnerability does not require user interaction and has a network attack vector with low complexity. No known exploits in the wild have been reported.
Mitigation Recommendations
This vulnerability has been patched in n8n versions 1.123.32, 2.17.4, and 2.18.1. Users should upgrade to these or later versions to remediate the issue. Since the vendor advisory does not indicate any temporary fixes or workarounds, applying the official update is the recommended mitigation.
CVE-2026-42228: CWE-862: Missing Authorization in n8n-io n8n
Description
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.
CVSS v4.0
Score 6.3medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-42228 in n8n-io's n8n product is due to missing authorization on the /chat WebSocket endpoint used by the Chat Trigger node's Hosted Chat feature. Before versions 1.123.32, 2.17.4, and 2.18.1, the endpoint did not verify if an incoming connection was authorized to interact with the target workflow execution. This allowed unauthenticated remote attackers who could identify a valid execution ID to attach to the workflow execution, receive prompts intended for legitimate users, and submit arbitrary inputs to affect workflow behavior. The issue is fixed in the mentioned versions.
Potential Impact
An unauthenticated remote attacker with knowledge of a valid execution ID can interfere with workflow executions by intercepting prompts and injecting arbitrary inputs. This can lead to unauthorized manipulation of workflow behavior, potentially disrupting automated processes or causing unintended actions within the affected n8n instances. The vulnerability does not require user interaction and has a network attack vector with low complexity. No known exploits in the wild have been reported.
Mitigation Recommendations
This vulnerability has been patched in n8n versions 1.123.32, 2.17.4, and 2.18.1. Users should upgrade to these or later versions to remediate the issue. Since the vendor advisory does not indicate any temporary fixes or workarounds, applying the official update is the recommended mitigation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-25T05:37:12.117Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69f8eaaecbff5d8610415af3
Added to database: 5/4/2026, 6:51:26 PM
Last enriched: 5/12/2026, 6:18:41 AM
Last updated: 6/18/2026, 8:23:46 AM
Views: 67
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