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

CVSS 5.1 · Medium EPSS 0.49% · P39

Possible ATT&CK Techniques 1AI

T1078.004 · Cloud Accounts

Affected Version Matrix 4

VendorProductVersion RangeStatus
n8n-ion8n< 2.30.1affected
2.30.1unaffected
< 2.29.8affected
2.29.8unaffected
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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

Affected Products

VendorProductAffected VersionsCPESubscribe
n8n-ion8n 0 ~ 2.30.1 -
n8n-ion8n 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-2026-655958.9 HIGHn8n before 2.30.1 Privilege Escalation via Token Exchange
CVE-2026-650167.7 HIGHn8n before 1.123.64 Privilege Escalation via SSO Instance-Role
CVE-2026-655895.1 MEDIUMn8n before 1.123.64 Credential Exposure via LLM Node Execution Data
CVE-2026-65597n8n before 1.123.64 DOM-Based XSS via Unsandboxed iframe
CVE-2026-65590n8n before 2.30.1 Shell Sandbox Bypass on Linux Windows
CVE-2026-65591n8n before 1.123.64 Sanitizer Bypass Remote Code Execution
CVE-2026-65592n8n before 1.123.64 Stored DOM XSS via cachedResultUrl
CVE-2026-65593n8n before 1.123.64 SSRF via Dynamic Node Parameters
CVE-2026-65599n8n before 1.123.64 Credential Exposure via JWT Header
CVE-2026-65015n8n before 2.30.1 Privilege Escalation via run_node_tool
CVE-2026-65596n8n before 1.123.64 Credential Exfiltration via GraphQL Node
CVE-2026-65014n8n before 2.28.0 Authentication Bypass via test-webhook
CVE-2026-65598n8n 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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