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CVE-2026-86077— n8n: Anonymous Approval-Gate Bypass via Reused resumeToken over the Chat WebSocket

Quick assessment

Affected
n8n-io n8n
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

n8n是n8n公司开源的一款支持持续集成与交付的工作流自动化工具。 n8n 2.37.7之前版本和2.38.0版本至2.38.2之前版本存在授权问题漏洞，该漏洞源于/chat WebSocket路由未检查目标节点是否支持聊天消息即恢复暂停执行，可能导致匿名表单提交者复用resumeToken释放Send-and-Wait、非聊天HITL或Wait审批门。

CVSS 6.3 · Medium EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
n8n-io n8n < 2.37.7 affected
>= 2.38.0, < 2.38.2 affected
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I. Basic Information for CVE-2026-86077

Vulnerability Information
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Vulnerability Title
n8n: Anonymous Approval-Gate Bypass via Reused resumeToken over the Chat WebSocket
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
n8n是n8n公司开源的一款支持持续集成与交付的工作流自动化工具。 n8n 2.37.7之前版本和2.38.0版本至2.38.2之前版本存在授权问题漏洞，该漏洞源于/chat WebSocket路由未检查目标节点是否支持聊天消息即恢复暂停执行，可能导致匿名表单提交者复用resumeToken释放Send-and-Wait、非聊天HITL或Wait审批门。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
n8n-io n8n < 2.37.7 -

II. Public POCs for CVE-2026-86077

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III. Intelligence Information for CVE-2026-86077

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Patches & Fixes for CVE-2026-86077 (1)

Vendor Advisories for CVE-2026-86077 (1)

Vendor Pages for CVE-2026-86077 (1)

Same Patch Batch · n8n-io · 2026-09-08 · 17 CVEs total

CVE-2026-86076 8.7 HIGH n8n: Expression Sandbox Escape in Editor-UI Enables Stored Cross-User JavaScript Execution
CVE-2026-86075 8.7 HIGH n8n: Unauthenticated Persistent Storage Exhaustion via OAuth Dynamic Client Registration E
CVE-2026-86083 7.7 HIGH n8n: Expression Sandbox Escape via Shared Builtin Tampering and Code-Printer Injection Lea
CVE-2026-86082 7.1 HIGH n8n: Domain-Restriction Bypass via Unguarded Model-Search Endpoint in OpenAI Chat Model No
CVE-2026-86081 7.1 HIGH n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a
CVE-2026-86080 6.3 MEDIUM n8n: GitHub Trigger 422 Reuse Path Skips Webhook Secret Storage, Causing Signature Verific
CVE-2026-86079 6.3 MEDIUM n8n: Path Injection in Elasticsearch and ElasticSecurity Nodes via Unencoded Identifiers
CVE-2026-86084 6.0 MEDIUM n8n: Disabled OIDC SSO Endpoints Remain Active and Issue Valid Sessions
CVE-2026-86078 6.0 MEDIUM n8n: Prototype Pollution via Workflow Structure Summary Can Lead to Denial of Service
CVE-2026-86073 5.9 MEDIUM n8n: Per-Resource OAuth Consent Bypass via Unbound Refresh Token Resource Substitution
CVE-2026-86074 5.9 MEDIUM n8n: Instance AI Credential Setup Accepts Unvalidated Probe URL from Fetched Content
CVE-2026-86993 5.9 MEDIUM n8n: Log Streaming Event Destinations Decrypt Generic-Auth Credentials Without Ownership C
CVE-2026-86994 5.3 MEDIUM n8n: Cross-User Active Workflow ID and Lifecycle Event Disclosure via Missing userId Filte
CVE-2026-86995 5.3 MEDIUM n8n: Git Node branch.<name>.remote Config Key Bypasses Sandbox Path Restriction, Enabling
CVE-2026-86996 5.3 MEDIUM n8n: Agent Workflow Tool Bypasses Sub-Workflow Caller Policy
CVE-2026-86085 5.1 MEDIUM n8n: Cross-Tenant Project-Member PII Disclosure via Missing Per-Project Scope Check on Rol

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-862

V. Comments for CVE-2026-86077

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