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.
Metrics
CVSS 3.1 5.3/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| n8n-io | n8n | < 2.27.4 |
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-33q9-f52j-gc75Mitigation, Vendor Advisory
- https://www.vulncheck.com/advisories/n8n-before-authentication-bypass-via-test-webhookThird Party Advisory
Timeline
- Published
- Jul 22, 2026
- Last modified
- Oct 29, 2026
- NVD status
- Analyzed