CVE-2026-86083— n8n: Expression Sandbox Escape via Shared Builtin Tampering and Code-Printer Injection Leads to Code 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 是一个开源的工作流自动化平台。在 1.123.76、2.37.7 和 2.38.2 之前的版本中，遗留表达式引擎在打印合成字符串字面量并插值时区数据时，会调用可变的全局 来生成源代码。攻击者控制的表达式可能会替换 ，导致后续生成的源代码中包含可执行的、由攻击者控制的代码。受影响的代码生成路径包括 和 。该问题不影响 vm 表达式引擎。此问题已在版本 1.123.76、2.37.7 和 2.38.2 中修复。
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I. Basic Information for CVE-2026-86083
Vulnerability Information
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Vulnerability Title
n8n: Expression Sandbox Escape via Shared Builtin Tampering and Code-Printer Injection Leads to Code 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 legacy expression engine generated source text by calling the mutable global JSON.stringify while printing synthetic string literals and interpolating timezone data. An expression could replace JSON.stringify and cause later generated source to contain executable attacker-controlled code. The affected code-generation paths include packages/@n8n/expression-runtime/src/bridge/isolated-vm-bridge.ts and packages/@n8n/tournament/src/ExpressionBuilder.ts, and the issue does not affect the vm expression engine. 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:N/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
Affected Products
II. Public POCs for CVE-2026-86083
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-86083 (1)
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🔗 Release n8n@2.38.2 · n8n-io/n8n · GitHub x_refsource_MISC
Vendor Advisories for CVE-2026-86083 (1)
Vendor Pages for CVE-2026-86083 (2)
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🔗 Release n8n@2.37.7 · n8n-io/n8n · GitHub x_refsource_MISC
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🔗 Release n8n@1.123.76 · 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-2026-86082 | 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
-
CVE-2026-86075
n8n: Unauthenticated Persistent Storage Exhaustion via OAuth -
CVE-2026-86076
n8n: Expression Sandbox Escape in Editor-UI Enables Stored C -
CVE-2026-86077
n8n: Anonymous Approval-Gate Bypass via Reused resumeToken o -
CVE-2026-86078
n8n: Prototype Pollution via Workflow Structure Summary Can -
CVE-2026-86079
n8n: Path Injection in Elasticsearch and ElasticSecurity Nod
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-2026-86077
n8n: Anonymous Approval-Gate Bypass via Reused resumeToken o -
CVE-2026-86078
n8n: Prototype Pollution via Workflow Structure Summary Can -
CVE-2026-86079
n8n: Path Injection in Elasticsearch and ElasticSecurity Nod
Same weakness: CWE-94
-
CVE-2026-86076
n8n: Expression Sandbox Escape in Editor-UI Enables Stored C -
CVE-2026-85983
Local Privilege Escalation in Auth0 AD/LDAP Connector -
CVE-2026-78625
Insufficient Validation of Dashboard Application Labels in O -
CVE-2026-78545
Improper Input Sanitization in Okta Access Gateway Applicati -
CVE-2026-76191
Animate | Improper Control of Generation of Code ('Code Inje
V. Comments for CVE-2026-86083
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