Vulnerability · Published Jul 22, 2026 · Assigned by VulnCheck

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

Medium 6.3

In plain English

A medium-severity missing authentication in n8n from n8n-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium

Exploit odds (30 days)0.6%top 51.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	n8n	2.27.4	GHSA-33q9-f52j-gc75

Affected products (as reported)

Vendor	Product	Versions
n8n-io	n8n	0 – before 2.27.4

Weakness: CWE-306 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References

GitHub Security Advisory (GHSA-33q9-f52j-gc75) vendor-advisory
VulnCheck Advisory: n8n before 2.28.0 Authentication Bypass via test-webhook third-party-advisory