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.
References
| Link | Resource |
|---|---|
| https://github.com/n8n-io/n8n/security/advisories/GHSA-q5xf-xhwf-cwqf | Mitigation Vendor Advisory |
| https://www.vulncheck.com/advisories/n8n-before-missing-oauth-authorization-check | Third Party Advisory |
Configurations
Configuration 1 (hide)
|
History
27 Jul 2026, 19:13
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 6.5 |
| First Time |
N8n
N8n n8n |
|
| CPE | cpe:2.3:a:n8n:n8n:*:*:*:*:enterprise:node.js:*:* cpe:2.3:a:n8n:n8n:2.30.0:*:*:*:enterprise:node.js:*:* cpe:2.3:a:n8n:n8n:*:*:*:*:community:node.js:*:* cpe:2.3:a:n8n:n8n:2.30.0:*:*:*:community:node.js:*:* |
|
| References | () https://github.com/n8n-io/n8n/security/advisories/GHSA-q5xf-xhwf-cwqf - Mitigation, Vendor Advisory | |
| References | () https://www.vulncheck.com/advisories/n8n-before-missing-oauth-authorization-check - Third Party Advisory |
22 Jul 2026, 12:18
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-22 12:18
Updated : 2026-07-27 19:13
NVD link : CVE-2026-65594
Mitre link : CVE-2026-65594
CVE.ORG link : CVE-2026-65594
JSON object : View
Products Affected
n8n
- n8n
CWE
CWE-863
Incorrect Authorization