CVE-2026-42228: CWE-862: Missing Authorization in n8n-io n8n
A missing authorization vulnerability exists in the n8n 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 incoming connections were authorized to interact with the target execution. An unauthenticated attacker who can identify a valid execution ID could attach to that execution, intercept pending prompts, and submit arbitrary input to influence workflow behavior. This vulnerability has been addressed in the specified patched versions.
AI Analysis
Technical Summary
CVE-2026-42228 is a missing authorization vulnerability (CWE-862) in n8n's /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 failed to verify authorization for incoming connections. This allowed unauthenticated remote attackers who could identify valid execution IDs in a waiting state to attach to those executions, receive prompts intended for legitimate users, and submit arbitrary inputs to resume or manipulate downstream workflow execution. The issue is fixed in the stated versions.
Potential Impact
An unauthenticated remote attacker can connect to the vulnerable WebSocket endpoint if they know a valid execution ID, potentially intercepting sensitive prompts and injecting arbitrary inputs to influence workflow execution. This could lead to unauthorized workflow manipulation. The CVSS 4.0 score is 6.3 (medium severity), reflecting network attack vector, low complexity, no privileges required, and partial impacts on confidentiality, integrity, and availability.
Mitigation Recommendations
This vulnerability is 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. No alternative mitigations or temporary fixes are indicated. Patch status is confirmed by the version information in the advisory.
CVE-2026-42228: CWE-862: Missing Authorization in n8n-io n8n
Description
A missing authorization vulnerability exists in the n8n 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 incoming connections were authorized to interact with the target execution. An unauthenticated attacker who can identify a valid execution ID could attach to that execution, intercept pending prompts, and submit arbitrary input to influence workflow behavior. This vulnerability has been addressed in the specified patched versions.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-42228 is a missing authorization vulnerability (CWE-862) in n8n's /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 failed to verify authorization for incoming connections. This allowed unauthenticated remote attackers who could identify valid execution IDs in a waiting state to attach to those executions, receive prompts intended for legitimate users, and submit arbitrary inputs to resume or manipulate downstream workflow execution. The issue is fixed in the stated versions.
Potential Impact
An unauthenticated remote attacker can connect to the vulnerable WebSocket endpoint if they know a valid execution ID, potentially intercepting sensitive prompts and injecting arbitrary inputs to influence workflow execution. This could lead to unauthorized workflow manipulation. The CVSS 4.0 score is 6.3 (medium severity), reflecting network attack vector, low complexity, no privileges required, and partial impacts on confidentiality, integrity, and availability.
Mitigation Recommendations
This vulnerability is 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. No alternative mitigations or temporary fixes are indicated. Patch status is confirmed by the version information in the advisory.
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: 5/4/2026, 7:07:14 PM
Last updated: 5/4/2026, 9:07:44 PM
Views: 5
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