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CVE-2026-65594— n8n before 2.30.1 Missing OAuth Authorization Check

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公司开源的一个可扩展的工作流自动化工具。 n8n 2.29.8之前版本和2.30.x版本（2.30.1之前版本）存在授权问题漏洞，该漏洞源于未验证已验证用户是否有权访问作为OAuth资源引用的工作流，可能导致成员级别的用户在配置了n8n OAuth2身份验证且至少有一个活跃MCP Server Trigger工作流的实例上，注册OAuth客户端、自行批准对其他用户工作流的同意并获得有效令牌，从而以所有者项目环境运行并读取输出数据。

CVSS 5.1 · Medium EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 4

VendorProduct Version RangeStatus
n8n-io n8n < 2.30.1 affected
2.30.1 unaffected
< 2.29.8 affected
2.29.8 unaffected
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I. Basic Information for CVE-2026-65594

Vulnerability Information
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Vulnerability Title
n8n before 2.30.1 Missing OAuth Authorization Check
Source: CVE Program / CVE List V5
Vulnerability Description
n8n before 2.29.8 and 2.30.x before 2.30.1 (affected from 2.27.0, when the OAuth 2.1 consent and token-issuance flow was introduced) does not verify that the authenticated user has access to the workflow referenced as the OAuth resource. On instances with at least one active MCP Server Trigger workflow configured with n8n OAuth2 authentication, a member-level user can register an OAuth client, self-approve consent for another user's workflow, and obtain a valid token. The workflow then runs in the owner's project context with the owner's stored credentials, and the attacker can set tool inputs and read outputs (potentially including data from the owner's connected integrations), breaking user and project isolation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
n8n 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
n8n是n8n公司开源的一个可扩展的工作流自动化工具。 n8n 2.29.8之前版本和2.30.x版本（2.30.1之前版本）存在授权问题漏洞，该漏洞源于未验证已验证用户是否有权访问作为OAuth资源引用的工作流，可能导致成员级别的用户在配置了n8n OAuth2身份验证且至少有一个活跃MCP Server Trigger工作流的实例上，注册OAuth客户端、自行批准对其他用户工作流的同意并获得有效令牌，从而以所有者项目环境运行并读取输出数据。
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 ~ 2.30.1 -
n8n-io n8n 0 ~ 2.29.8 -

II. Public POCs for CVE-2026-65594

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III. Intelligence Information for CVE-2026-65594

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Vendor Advisories for CVE-2026-65594 (1)

Other References for CVE-2026-65594 (1)

Same Patch Batch · n8n-io · 2026-07-22 · 14 CVEs total

CVE-2026-65595 8.9 HIGH n8n before 2.29.8 and 2.30.1 Privilege Escalation via Token Exchange
CVE-2026-65016 7.7 HIGH n8n before 1.123.64, 2.29.8, and 2.30.1 Privilege Escalation via SSO Instance-Role
CVE-2026-65593 6.3 MEDIUM n8n before 1.123.64, 2.29.8, and 2.30.1 SSRF via Dynamic Node Parameters
CVE-2026-65599 5.1 MEDIUM n8n before 1.123.64, 2.29.8, and 2.30.1 Credential Exposure via JWT Header
CVE-2026-65589 5.1 MEDIUM n8n before 1.123.64 Credential Exposure via LLM Node Execution Data
CVE-2026-65597 n8n before 1.123.64 DOM-Based XSS via Unsandboxed iframe
CVE-2026-65590 n8n before 2.30.1 Shell Sandbox Bypass on Linux Windows
CVE-2026-65591 n8n before 1.123.64 Sanitizer Bypass Remote Code Execution
CVE-2026-65592 n8n before 1.123.64 Stored DOM XSS via cachedResultUrl
CVE-2026-65015 n8n before 2.30.1 Privilege Escalation via run_node_tool
CVE-2026-65596 n8n before 1.123.64 Credential Exfiltration via GraphQL Node
CVE-2026-65014 n8n before 2.28.0 Authentication Bypass via test-webhook
CVE-2026-65598 n8n before 1.123.64 Remote Code Execution via Git Clone

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-863

V. Comments for CVE-2026-65594

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