CVE-2026-86077: CWE-862: Missing Authorization in n8n-io n8n
n8n versions prior to 2.37.7 and 2.38.2 contain a missing authorization vulnerability in the /chat WebSocket route. This flaw allows an anonymous user who obtains a resumeToken to resume a paused execution improperly, bypassing checks that the target node supports chat messages. The issue is fixed in versions 2.37.7 and 2.38.2.
AI Analysis
Technical Summary
The vulnerability in n8n (CVE-2026-86077) arises from missing authorization checks in the /chat WebSocket route. Specifically, the resumeToken used to resume paused executions was accepted without verifying that the target node supports chat messages. This allowed an anonymous attacker with access to a resumeToken to reuse it to resume executions involving Send-and-Wait, non-chat HITL, or Wait approval gates improperly. The affected code is located in packages/cli/src/chat/chat-execution-manager.ts, where the canResumeOverChat function failed to gate the resume target. The issue is resolved in n8n versions 2.37.7 and 2.38.2.
Potential Impact
An attacker who obtains a resumeToken can bypass authorization controls to resume paused workflow executions that should not be resumable via the chat interface. This could lead to unintended workflow progress or actions without proper authorization. The vulnerability has a CVSS 4.0 score of 6.3 (medium severity), indicating a moderate risk with network attack vector, low complexity, and no privileges required.
Mitigation Recommendations
This vulnerability is fixed in n8n versions 2.37.7 and 2.38.2. Users should upgrade to at least these versions to remediate the issue. No official patch links were provided, but upgrading to the fixed versions is the recommended action. Since this is not a cloud service, users must apply the update themselves.
CVE-2026-86077: CWE-862: Missing Authorization in n8n-io n8n
Description
n8n versions prior to 2.37.7 and 2.38.2 contain a missing authorization vulnerability in the /chat WebSocket route. This flaw allows an anonymous user who obtains a resumeToken to resume a paused execution improperly, bypassing checks that the target node supports chat messages. The issue is fixed in versions 2.37.7 and 2.38.2.
CVSS v4.0
Score 6.3medium
Affected software
pkg:github/n8n-io/n8nRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in n8n (CVE-2026-86077) arises from missing authorization checks in the /chat WebSocket route. Specifically, the resumeToken used to resume paused executions was accepted without verifying that the target node supports chat messages. This allowed an anonymous attacker with access to a resumeToken to reuse it to resume executions involving Send-and-Wait, non-chat HITL, or Wait approval gates improperly. The affected code is located in packages/cli/src/chat/chat-execution-manager.ts, where the canResumeOverChat function failed to gate the resume target. The issue is resolved in n8n versions 2.37.7 and 2.38.2.
Potential Impact
An attacker who obtains a resumeToken can bypass authorization controls to resume paused workflow executions that should not be resumable via the chat interface. This could lead to unintended workflow progress or actions without proper authorization. The vulnerability has a CVSS 4.0 score of 6.3 (medium severity), indicating a moderate risk with network attack vector, low complexity, and no privileges required.
Mitigation Recommendations
This vulnerability is fixed in n8n versions 2.37.7 and 2.38.2. Users should upgrade to at least these versions to remediate the issue. No official patch links were provided, but upgrading to the fixed versions is the recommended action. Since this is not a cloud service, users must apply the update themselves.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-04T19:34:03.100Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6aa08023acd9273b4940c398
Added to database: 09/08/2026, 21:37:39 UTC
Last enriched: 09/08/2026, 21:52:53 UTC
Last updated: 09/08/2026, 22:27:58 UTC
Views: 5
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