CVE-2026-65014: n8n

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• n8n n8n: from 2.27.0, before 2.27.4 (fixed in 2.27.4)

Published 2026-07-22. Last modified 2026-07-27.