Auth bypass in N8n
CVE-2026-56778
n8n before 2.25.7 and 2.26.x before 2.26.2 contains an authorization bypass in the Public API execution retry endpoint, which authorizes access using the workflow:read scope instead of workflow:execute. An authenticated user with read-only access to a shared workflow can use the Public API to retry executions of that workflow, bypassing the intended permission boundary between read and execute access. This affects instances where workflows are shared with other users or across projects.
Vulnerability class: Broken Access Control
EPSS: 0.002 (7.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
Affected products
- N8n — versions 0, 2.26.2, 2.25.7
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-2026-56778?
- CVE-2026-56778 is a medium-severity vulnerability in N8n, classified under Incorrect Authorization. CVSS score: 6.4/10. Published 2026-07-08.
- How severe is CVE-2026-56778?
- Medium severity. CVSS v3 base score is 6.4 out of 10.