CVE-2026-65014: 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

mediumCVSS 5.3CVE-2026-65014

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 5.3
Published: 2026-07-22
Last updated: 2026-07-27
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-65014

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-650140.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-65014	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

mediumGHSA-33q9-f52j-gc75: n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhookghsa

Recent advisories for n8n

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[NEW] [high] n8n: Multiple vulnerabilitiescert-bund · 2026-07-23
mediumGHSA-652q-gvq3-74qv: n8n: Snowflake Node executeQuery Operation Allows SQL Injection via Unparameterized Expre…ghsa · 2026-07-22
mediumGHSA-jqwr-vx3p-r266: n8n: PostgresTrigger Node SQL Injection Allows Authenticated Users to Execute Arbitrary S…ghsa · 2026-07-22
mediumGHSA-9cmh-xcqm-5hqr: n8n: Cross-Tenant Module-Cache Poisoning in the JS Task Runnerghsa · 2026-07-22
mediumGHSA-89gh-3pgc-v5h2: n8n: Custom Header Credential Values Leaked in Plaintext into LLM Node Execution Dataghsa · 2026-07-22
mediumGHSA-33q9-f52j-gc75: n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhookghsa · 2026-07-22