CVE-2026-65014

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

Product

N8n

PublishedJul 22, 2026

First seenJul 22, 2026

Weakness typeCWE-306Missing authentication for critical function

How to fix

Update

n8n n8n2.27.4 or later
n8n2.27.4 or later

Vendor advisories

github.com/n8n-io/n8n/security/advisories/GHSA-33q9-f52j-gc75

Affected products

Product	Affected versions	Fixed in
n8n n8n	2.27.0 ≤ v < 2.27.4	2.27.4
n8nnpm	v < 2.27.4	2.27.4

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