| Component | n8n |
| Severity | medium (CVSS 5.3) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| Published (NVD) | 2026-07-22 |
| Last modified | 2026-07-27 |
| Affected versions | n8n >= 2.27.0, < 2.27.4 n8n >= 2.27.0, < 2.27.4 |
| Fixed in | 2.27.4 |
| Weakness | CWE-306 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade n8n to
2.27.4or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-65014
- https://github.com/n8n-io/n8n/security/advisories/GHSA-33q9-f52j-gc75
- https://www.vulncheck.com/advisories/n8n-before-authentication-bypass-via-test-webhook
Read more
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