CVE-2026-65014: n8n from 2.27.0 (inclusive), before 2.27.4 (exclusive), 0 to before 2.28.0, 0 to before 2.27.4

Affected technology

n8n · from 2.27.0 (inclusive), before 2.27.4 (exclusive)
n8n

n8n · 0 to before 2.28.0
n8n-io

n8n · 0 to before 2.27.4
n8n-io

Description’s affected range: 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

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

Vendor/CNA’s CVSS 4.0 assessment (base score 6.3/10) rates confidentiality and integrity impact as none; availability impact as low. The description does not specify what an attacker can achieve beyond these rated impacts.