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 是一个开源的工作流自动化平台。在 2.37.7 和 2.38.2 版本之前， WebSocket 路由在接收 并恢复暂停的执行时，未检查目标节点是否支持聊天消息。任何匿名表单提交者若能获取该令牌，便可在 路由中复用该令牌，从而释放“发送并等待”（Send-and-Wait）、非聊天的人机交互（HITL）或等待审批门。受影响的授权逻辑位于 ，其中 未对恢复的目标节点进行约束。该问题已在版本 2.37.7 和 2.38.2 中修复。
Possible ATT&CK Techniques 1 AI
T1078 · Valid Accounts
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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
Affected Products
II. Public POCs for CVE-2026-86077
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-86077 (1)
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🔗 Release n8n@2.38.2 · n8n-io/n8n · GitHub x_refsource_MISC
Vendor Advisories for CVE-2026-86077 (1)
Vendor Pages for CVE-2026-86077 (1)
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🔗 Release n8n@2.37.7 · n8n-io/n8n · GitHub x_refsource_MISC
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
-
CVE-2026-86075
n8n: Unauthenticated Persistent Storage Exhaustion via OAuth -
CVE-2026-86076
n8n: Expression Sandbox Escape in Editor-UI Enables Stored C -
CVE-2026-86078
n8n: Prototype Pollution via Workflow Structure Summary Can -
CVE-2026-86079
n8n: Path Injection in Elasticsearch and ElasticSecurity Nod -
CVE-2026-86080
n8n: GitHub Trigger 422 Reuse Path Skips Webhook Secret Stor
Same vendor: n8n-io
-
CVE-2026-86075
n8n: Unauthenticated Persistent Storage Exhaustion via OAuth -
CVE-2026-86076
n8n: Expression Sandbox Escape in Editor-UI Enables Stored C -
CVE-2026-86078
n8n: Prototype Pollution via Workflow Structure Summary Can -
CVE-2026-86079
n8n: Path Injection in Elasticsearch and ElasticSecurity Nod -
CVE-2026-86080
n8n: GitHub Trigger 422 Reuse Path Skips Webhook Secret Stor
Same weakness: CWE-862
-
CVE-2026-12956
Eventin <= 4.1.22 - Missing Authorization to Unauthenticated -
CVE-2026-87036
Tanium addressed an improper access controls vulnerability i -
CVE-2026-87048
Tanium addressed an improper access controls vulnerability i -
CVE-2026-87073
Tanium addressed an improper access controls vulnerability i -
CVE-2026-87072
Tanium addressed an improper access controls vulnerability i
V. Comments for CVE-2026-86077
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