Vulnerability · Published Jul 8, 2026 · Assigned by VulnCheck

CVE-2026-56775n8n - Incorrect OAuth Scope Validation in Evaluation Test Runs Endpoints

Medium 5.4

In plain English

A medium-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 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 76.9% 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 vulnerability in three mutating evaluation test-run endpoints that authorize state-changing actions using the workflow:read scope instead of the action-appropriate workflow:execute scope. On instances using Advanced Permissions (Enterprise/Cloud) with projects and viewer roles, an authenticated user with the project:viewer role can start new evaluation test runs, cancel in-flight runs, and delete run records for workflows they only have read access to.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	n8n	1.123.55	GHSA-664h-gpgq-h6xx
npm	n8n	2.26.2	GHSA-664h-gpgq-h6xx
npm	n8n	2.25.7	GHSA-664h-gpgq-h6xx

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:U/C:N/I:L/A:L

References

GitHub Security Advisory (GHSA-664h-gpgq-h6xx) vendor-advisory
VulnCheck Advisory: n8n - Incorrect OAuth Scope Validation in Evaluation Test Runs Endpoints third-party-advisory