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CVE-2026-77073— n8n before 2.34.1 Cross-Project Credential Access via MCP

CVSS 5.3 · Medium EPSS 0.30% · P22

Affected Version Matrix 4

VendorProductVersion RangeStatus
n8n-ion8n2.34.0< 2.34.1affected
2.34.1unaffected
2.0.0< 2.33.4affected
2.33.4unaffected
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I. Basic Information for CVE-2026-77073

Vulnerability Information
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Vulnerability Title
n8n before 2.34.1 Cross-Project Credential Access via MCP
Source: CVE Program / CVE List V5
Vulnerability Description
n8n versions before 2.34.1 contain a credential validation bypass in the MCP create_workflow_from_code tool when authentication type is set to an expression. Attackers with a valid MCP Bearer API key and knowledge of a target credential ID can persist unauthorized cross-project credential references on workflows in different projects.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

VendorProductAffected VersionsCPESubscribe
n8n-ion8n 2.34.0 ~ 2.34.1 -
n8n-ion8n 2.0.0 ~ 2.33.4 -

II. Public POCs for CVE-2026-77073

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III. Intelligence Information for CVE-2026-77073

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Vendor Advisories for CVE-2026-77073 (2)

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

CVE-2026-770808.7 HIGHn8n before 1.123.69 Arbitrary File Read and Write via Snowflake
CVE-2026-770688.7 HIGHn8n before 2.34.1 Remote Code Execution via Path Traversal
CVE-2026-770758.4 HIGHn8n before 1.123.69 Expression Injection via Resource Locator
CVE-2026-770728.4 HIGHn8n before 1.123.69 Stored XSS via Form Completion Page
CVE-2026-770847.7 HIGHn8n before 1.123.69 Remote Code Execution via Git Node Configuration Values
CVE-2026-770797.4 HIGHn8n before 2.34.1 Authorization Bypass via Custom Role Deletion
CVE-2026-770777.2 HIGHn8n before 1.123.69 Remote Code Execution via EventEmitter Prototype Pollution
CVE-2026-770717.1 HIGHn8n before 1.123.69 PostgREST Filter Injection via Supabase
CVE-2026-770767.1 HIGHn8n before 1.123.69 Credential Leak via GraphQL Node Error
CVE-2026-770707.1 HIGHn8n before 1.123.69 NoSQL Injection via MongoDB Node
CVE-2026-770856.3 MEDIUMn8n before 2.34.1 SSRF Protection Bypass via SearXNG Tool
CVE-2026-770836.0 MEDIUMn8n before 1.123.69 Code Node Sandbox Escape via Function.prototype Pollution
CVE-2026-770746.0 MEDIUMn8n before 1.123.69 SSRF via Edit Image Node
CVE-2026-770825.3 MEDIUMn8n before 1.123.69 ReDoS via Filter and Switch Node
CVE-2026-770815.1 MEDIUMn8n before 1.123.69 Allowed-Domains Bypass via GraphQL Node
CVE-2026-770692.3 LOWn8n before 1.123.69 SSRF Protection Bypass via OAuth2

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-639

V. Comments for CVE-2026-77073

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