AI agent vulnerability · n8n

CVE-2026-65014: n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhook

mediumCVSS 4.0 6.3GHSA-33q9-f52j-gc75

Impact The DELETE /${restEndpoint}/test-webhook/:id route is registered before the 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.

Published Jul 22, 2026 · Updated Aug 10, 2026

Affected packages

n8n

Ecosystem: npm
Affected: < 2.27.4
Fixed in: 2.27.4
Check: npm ls n8n

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Impact

The DELETE /${restEndpoint}/test-webhook/:id route is registered before the 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.

Patches

Users should upgrade to the patched version once available to remediate the vulnerability.

Workarounds

If upgrading is not immediately possible, administrators should consider the following temporary mitigations:

Restrict network access to the n8n instance to fully trusted users only.
Place the n8n instance behind a reverse proxy or firewall that requires authentication before reaching the REST API.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Credited to jeongbeannnn.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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