Auth bypass in N8n
CVE-2026-65014
n8n before 2.28.0 (and before 2.27.4 on the 2.27.x branch) registers the DELETE /${restEndpoint}/test-webhook/:id endpoint before authentication middleware is applied, allowing any unauthenticated network caller who knows a workflow ID to cancel that workflow's active test webhook registration. The impact is limited to disrupting in-progress test sessions; production webhooks, persistent workflow state, and stored data are not affected.
Vulnerability class: Broken Authentication
EPSS: 0.003 (26.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- N8n
- N8n-io N8n — versions 0, 2.28.0, 2.27.4
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-2026-65014?
- CVE-2026-65014 is a medium-severity vulnerability in N8n, classified under Missing Authentication for Critical Function. CVSS score: 5.3/10. Published 2026-07-22.
- How severe is CVE-2026-65014?
- Medium severity. CVSS v3 base score is 5.3 out of 10.