CVE-2026-86077: CWE-862: Missing Authorization in n8n-io n8n
Description
n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.2, the /chat WebSocket route accepted a resumeToken and resumed a paused execution without checking that the target node supported chat messages. An anonymous form submitter who received that token could reuse it on the chat route to release a Send-and-Wait, non-chat HITL, or Wait approval gate. The affected authorization logic is packages/cli/src/chat/chat-execution-manager.ts, where canResumeOverChat did not gate the resume target. This issue is fixed in versions 2.37.7 and 2.38.2.
CVSS v4.0
Score 6.3medium
Affected software
n8n-io
n8n
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) involves missing authorization in the /chat WebSocket route. Specifically, the route accepted a resumeToken and resumed paused executions without verifying that the target node supported chat messages. This allowed an anonymous attacker with a valid token to resume executions involving Send-and-Wait, non-chat HITL, or Wait approval gates improperly. The flawed authorization logic was located in packages/cli/src/chat/chat-execution-manager.ts, where the function canResumeOverChat failed to gate the resume target. The issue was addressed and fixed in n8n versions 2.37.7 and 2.38.2.
Potential Impact
An attacker who obtains a resumeToken can bypass authorization checks and resume paused workflow executions that should be gated, potentially disrupting workflow processes or causing unintended execution of workflow steps. The vulnerability does not require privileges or user interaction but does require possession of a valid resumeToken. The CVSS 4.0 score is 6.3 (medium severity), reflecting network attack vector, low complexity, no privileges required, no user interaction, and limited confidentiality, integrity, and availability impacts.
Mitigation Recommendations
This vulnerability is fixed in n8n versions 2.37.7 and 2.38.2. Users should upgrade to these or later versions to remediate the issue. Since this is not a cloud service, remediation depends on user action to update affected installations.
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
Threat ID: 6aa08023acd9273b4940c398
Added to database: 09/08/2026, 21:37:39 UTC
Last enriched: 09/16/2026, 01:12:46 UTC
Last updated: 10/23/2026, 15:10:15 UTC
Views: 77
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