CVE-2026-65014: Missing Authentication for Critical Function in n8n-io n8n
n8n before 2.28.0 (and before 2.27.4 on the 2.27.x branch) registers the DELETE /${restEndpoint}/test-webhook/:id endpoint before authentication middleware is applied, allowing any unauthenticated network caller who knows a workflow ID to cancel that workflow's active test webhook registration. The impact is limited to disrupting in-progress test sessions; production webhooks, persistent workflow state, and stored data are not affected.
AI Analysis
Technical Summary
CVE-2026-65014 describes a missing authentication control in n8n versions prior to 2.27.4 and 2.28.0. Specifically, the DELETE /${restEndpoint}/test-webhook/:id endpoint is registered before authentication middleware is applied, enabling unauthenticated users who know a workflow ID to cancel active test webhook registrations. The vulnerability is limited in scope to disrupting in-progress test webhook sessions without affecting production webhooks or stored data.
Potential Impact
The vulnerability allows unauthenticated attackers to disrupt active test webhook sessions by cancelling their registrations. There is no impact on production webhooks, persistent workflow state, or stored data, limiting the overall damage to test environments only.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Users should upgrade to n8n version 2.27.4 or later on the 2.27.x branch, or 2.28.0 or later on the main branch, where this issue is addressed by applying authentication middleware before the affected endpoint.
CVE-2026-65014: Missing Authentication for Critical Function in n8n-io n8n
Description
n8n before 2.28.0 (and before 2.27.4 on the 2.27.x branch) registers the DELETE /${restEndpoint}/test-webhook/:id endpoint before authentication middleware is applied, allowing any unauthenticated network caller who knows a workflow ID to cancel that workflow's active test webhook registration. The impact is limited to disrupting in-progress test sessions; production webhooks, persistent workflow state, and stored data are not affected.
CVSS v4.0
Score 6.3medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-65014 describes a missing authentication control in n8n versions prior to 2.27.4 and 2.28.0. Specifically, the DELETE /${restEndpoint}/test-webhook/:id endpoint is registered before authentication middleware is applied, enabling unauthenticated users who know a workflow ID to cancel active test webhook registrations. The vulnerability is limited in scope to disrupting in-progress test webhook sessions without affecting production webhooks or stored data.
Potential Impact
The vulnerability allows unauthenticated attackers to disrupt active test webhook sessions by cancelling their registrations. There is no impact on production webhooks, persistent workflow state, or stored data, limiting the overall damage to test environments only.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Users should upgrade to n8n version 2.27.4 or later on the 2.27.x branch, or 2.28.0 or later on the main branch, where this issue is addressed by applying authentication middleware before the affected endpoint.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-07-21T11:32:54.897Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a60ab919c2644c7f8ece865
Added to database: 07/22/2026, 11:37:53 UTC
Last enriched: 07/22/2026, 11:53:52 UTC
Last updated: 07/23/2026, 02:51:54 UTC
Views: 4
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