Kurz gesagt
- CVE-2026-86077 ist eine Schwachstelle (MITTEL (CVSS 6.5)) in n8n (n8n), n8n.
- Wahrscheinlichkeit einer Ausnutzung in den nächsten 30 Tagen (EPSS): 0.43%, höher als bei 37.4% aller Schwachstellen.
- Abhilfe: auf 2.38.2, 2.37.7 oder neuer aktualisieren.
| Package | Affected versions | Patched versions |
|---|
| n8n | ≥ 2.38.0, < 2.38.2< 2.37.7
| 2.38.22.37.7
|
| n8n npm | ≥ 2.38.0, < 2.38.2< 2.37.7
| 2.38.22.37.7
|
Description
Impact
The /chat WebSocket route resumed a paused execution from a resume token without checking that the node being resumed was a chat node. n8n hands that token to anonymous form submitters, so a party with no account could present it on the chat route and release an execution waiting at an approval gate, the control an author puts in front of an action considered too consequential to automate. The patch restricts resume over the chat route and Chat Hub to chat-capable node types.
Patches
The issue has been fixed in n8n versions 2.37.7 and 2.38.2. Users should upgrade to one of these versions or later to remediate the vulnerability.
Workarounds
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
- Restrict n8n instance access to fully trusted users only.
- Avoid workflows that combine a Form Trigger with non-chat approval gates (Send-and-Wait, Telegram/Slack/Gmail HITL, or plain Wait nodes) on publicly accessible instances.
- Audit recent executions of such workflows for unexpected completion without a corresponding approval callback.
These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
NVD 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.
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