CVE-2026-65014 n8n before 2.28.0 Authentication Bypass via test-webhook

Medium 6.3 Published 22 Jul 2026 Updated 29 Oct 2026

Unauthenticated attackers can cancel active test webhooks in n8n by exploiting an endpoint registered before authentication middleware.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-65014?

CVE-2026-65014 is a medium-severity authentication bypass vulnerability in N8n N8n, published on 22 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-306

Which versions are affected by CVE-2026-65014?

2 open source packages ship an affected version, including n8n. It affects 1 product.

Package	Affected	Fixed in
`n8n` npm	All versions	`2.27.4`
`n8n` npm	All versions	`2.27.4`

Products include N8n N8n.

How do I fix CVE-2026-65014?

Upgrade n8n to 2.27.4 or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-65014 being exploited?

There is no known exploitation of CVE-2026-65014 in the wild and no public exploit code.

All N8n N8n vulnerabilities

Sources

Also known as GHSA-33q9-f52j-gc75, MINI-xww3-rcmw-g6mp.