CVE-2026-56775

n8n - Incorrect OAuth Scope Validation in Evaluation Test Runs Endpoints

State: Published
Severity: 5.3 Medium
Published: Jul 8, 2026
Updated: Oct 29, 2026
Reserved: Jun 23, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N	VulnCheck
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L	VulnCheck

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
n8nn8n	before 1.123.55Affected 1.123.55Not affected
n8nn8n	2.26.0 to before 2.26.2Affected 2.26.2Not affected
n8nn8n	2.0.0-rc.0 to before 2.25.7Affected 2.25.7Not affected

References

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

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