Auth bypass in N8n
CVE-2026-56775
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.
Vulnerability class: Broken Access Control
EPSS: 0.002 (7.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
Affected products
- N8n — versions 0, 1.123.55, 2.26.2
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory, Mitigation, Vendor Advisory)
- disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-56775?
- CVE-2026-56775 is a medium-severity vulnerability in N8n, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-07-08.
- How severe is CVE-2026-56775?
- Medium severity. CVSS v3 base score is 5.4 out of 10.