CVE-2026-65014

Description

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.

References

• https://github.com/n8n-io/n8n/security/advisories/GHSA-33q9-f52j-gc75
• https://www.vulncheck.com/advisories/n8n-before-authentication-bypass-via-test-webhook