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CVE-2026-86076— n8n: Expression Sandbox Escape in Editor-UI Enables Stored Cross-User JavaScript Execution

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 1.123.76之前版本、2.37.7之前版本和2.38.2之前版本存在代码注入漏洞，该漏洞源于表达式编译器净化器通过动态作用域的this解析且未拒绝保留的类成员名称，名为__sanitize的类字段可重新绑定净化器并访问Function构造函数，可能导致后端代码执行和编辑器预览JavaScript执行。

CVSS 8.7 · High EPSS 0.79% · P56

Affected Version Matrix 3

VendorProduct Version RangeStatus
n8n-io n8n >= 2.38.0, < 2.38.2 affected
>= 2.0.0, < 2.37.7 affected
< 1.123.76 affected
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I. Basic Information for CVE-2026-86076

Vulnerability Information
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Vulnerability Title
n8n: Expression Sandbox Escape in Editor-UI Enables Stored Cross-User JavaScript Execution
Source: CVE Program / CVE List V5
Vulnerability Description
n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the expression compiler sanitizer resolved through dynamically scoped this and did not reject reserved class member names. A class field named __sanitize could rebind the sanitizer and reach the Function constructor, enabling backend code execution and editor-preview JavaScript execution. The affected AST hook is PrototypeSanitizer in packages/workflow/src/expression-sandboxing.ts. This issue is fixed in versions 1.123.76, 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:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 代码注入漏洞
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 1.123.76之前版本、2.37.7之前版本和2.38.2之前版本存在代码注入漏洞，该漏洞源于表达式编译器净化器通过动态作用域的this解析且未拒绝保留的类成员名称，名为__sanitize的类字段可重新绑定净化器并访问Function构造函数，可能导致后端代码执行和编辑器预览JavaScript执行。
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 >= 2.38.0, < 2.38.2 -

II. Public POCs for CVE-2026-86076

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III. Intelligence Information for CVE-2026-86076

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Patches & Fixes for CVE-2026-86076 (1)

Vendor Advisories for CVE-2026-86076 (1)

Vendor Pages for CVE-2026-86076 (2)

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

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-2026-86077 6.3 MEDIUM n8n: Anonymous Approval-Gate Bypass via Reused resumeToken over the Chat WebSocket
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-94