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CVE-2026-77083— n8n before 1.123.69 Code Node Sandbox Escape via Function.prototype Pollution

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 1.123.69之前版本、2.33.4之前版本和2.34.1之前版本存在输入验证错误漏洞，该漏洞源于JavaScript Code节点的VM沙箱未冻结Function.prototype，允许已认证用户创建并执行工作流，通过原型污染获取宿主globalThis引用，导致沙箱逃逸。

CVSS 6.0 · Medium EPSS 0.37% · P29

Affected Version Matrix 6

VendorProduct Version RangeStatus
n8n-io n8n < 1.123.69 affected
1.123.69 unaffected
2.34.0< 2.34.1 affected
2.34.1 unaffected
2.0.0< 2.33.4 affected
2.33.4 unaffected
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I. Basic Information for CVE-2026-77083

Vulnerability Information
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Vulnerability Title
n8n before 1.123.69 Code Node Sandbox Escape via Function.prototype Pollution
Source: CVE Program / CVE List V5
Vulnerability Description
n8n is a workflow automation platform. In versions prior to 1.123.69, 2.33.4, and 2.34.1, the JavaScript Code node's VM sandbox did not freeze the sandbox's Function.prototype, allowing an authenticated user with the ability to create and execute workflows to pollute it from within a Code node execution and recover a reference to the host's globalThis, resulting in a sandbox escape. The full exploit chain additionally depends on specific modules being available as allowlisted imports in the deployment's configuration. The issue is fixed in versions 1.123.69, 2.33.4, and 2.34.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 输入验证错误漏洞
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 1.123.69之前版本、2.33.4之前版本和2.34.1之前版本存在输入验证错误漏洞，该漏洞源于JavaScript Code节点的VM沙箱未冻结Function.prototype，允许已认证用户创建并执行工作流，通过原型污染获取宿主globalThis引用，导致沙箱逃逸。
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 0 ~ 1.123.69 -
n8n-io n8n 2.34.0 ~ 2.34.1 -
n8n-io n8n 2.0.0 ~ 2.33.4 -

II. Public POCs for CVE-2026-77083

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III. Intelligence Information for CVE-2026-77083

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Vendor Advisories for CVE-2026-77083 (1)

Exploits & Public PoCs for CVE-2026-77083 (1)

Same Patch Batch · n8n-io · 2026-08-20 · 17 CVEs total

CVE-2026-77080 8.7 HIGH n8n before 1.123.69 Arbitrary File Read and Write via Snowflake
CVE-2026-77068 8.7 HIGH n8n before 2.34.1 Remote Code Execution via Path Traversal
CVE-2026-77075 8.4 HIGH n8n before 1.123.69 Expression Injection via Resource Locator
CVE-2026-77072 8.4 HIGH n8n before 1.123.69 Stored XSS via Form Completion Page
CVE-2026-77084 7.7 HIGH n8n before 1.123.69 Remote Code Execution via Git Node Configuration Values
CVE-2026-77079 7.4 HIGH n8n before 2.34.1 Authorization Bypass via Custom Role Deletion
CVE-2026-77077 7.2 HIGH n8n before 1.123.69 Remote Code Execution via EventEmitter Prototype Pollution
CVE-2026-77071 7.1 HIGH n8n before 1.123.69 PostgREST Filter Injection via Supabase
CVE-2026-77076 7.1 HIGH n8n before 1.123.69 Credential Leak via GraphQL Node Error
CVE-2026-77070 7.1 HIGH n8n before 1.123.69 NoSQL Injection via MongoDB Node
CVE-2026-77085 6.3 MEDIUM n8n before 2.34.1 SSRF Protection Bypass via SearXNG Tool
CVE-2026-77074 6.0 MEDIUM n8n before 1.123.69 SSRF via Edit Image Node
CVE-2026-77073 5.3 MEDIUM n8n before 2.34.1 Cross-Project Credential Access via MCP
CVE-2026-77082 5.3 MEDIUM n8n before 1.123.69 ReDoS via Filter and Switch Node
CVE-2026-77081 5.1 MEDIUM n8n before 1.123.69 Allowed-Domains Bypass via GraphQL Node
CVE-2026-77069 2.3 LOW n8n before 1.123.69 SSRF Protection Bypass via OAuth2

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-1321

V. Comments for CVE-2026-77083

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