Vulnerability · Published Jul 8, 2026 · Assigned by VulnCheck

CVE-2026-56776n8n - Incorrect OAuth Scope Validation in Workflow Test Run Endpoint

High 7.4

In plain English

A high-severity incorrect authorization in n8n from n8n. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.4High

Exploit odds (30 days)0.3%top 79.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

n8n before 1.123.55, 2.25.7, and 2.26.2 contains an authorization bypass in the POST /workflows/{workflowId}/test-runs/new endpoint, which authorizes access using the workflow:read scope instead of workflow:execute. An authenticated user with read-only access to a workflow can trigger a real evaluation test run, causing the workflow to execute via the internal workflow runner and resulting in unintended outbound API calls, data mutations, or other side effects in connected downstream systems. The issue primarily affects instances using the Evaluations feature where RBAC project roles grant workflow:read without workflow:execute.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	n8n	1.123.55	GHSA-hv7x-3x78-gx53
npm	n8n	2.26.2	GHSA-hv7x-3x78-gx53
npm	n8n	2.25.7	GHSA-hv7x-3x78-gx53

Affected products (as reported)

Vendor	Product	Versions
n8n	n8n	0 – before 1.123.55
n8n	n8n	2.26.0 – before 2.26.2
n8n	n8n	2.0.0-rc.0 – before 2.25.7

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

References

GitHub Security Advisory (GHSA-hv7x-3x78-gx53) vendor-advisory
VulnCheck Advisory: n8n - Incorrect OAuth Scope Validation in Workflow Test Run Endpoint third-party-advisory