CVE-2026-86077 PUBLISHED

n8n: Anonymous Approval-Gate Bypass via Reused resumeToken over the Chat WebSocket

Assigner: GitHub_M
Reserved: 04.09.2026 Published: 08.09.2026 Updated: 08.09.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
CVSS Score: 6.3

Product Status

Vendor n8n-io
Product n8n
Versions
  • Version < 2.37.7 is affected
  • Version >= 2.38.0, < 2.38.2 is affected

References

Problem Types

  • CWE-862: Missing Authorization CWE