Vulnerability · Published Jul 22, 2026 · Assigned by VulnCheck
CVE-2026-65594n8n before 2.30.1 Missing OAuth Authorization Check
Medium 5.1
In plain English
A medium-severity incorrect authorization in n8n from n8n-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | n8n | 2.30.1 | GHSA-q5xf-xhwf-cwqf |
| npm | n8n | 2.29.8 | GHSA-q5xf-xhwf-cwqf |
Affected products (as reported)
Weakness: CWE-863 · Vector: 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
References
- GitHub Security Advisory (GHSA-q5xf-xhwf-cwqf) vendor-advisory
- VulnCheck Advisory: n8n before 2.30.1 Missing OAuth Authorization Check third-party-advisory