CVE-2026-65014
n8n before 2.28.0 Authentication Bypass via test-webhook
n8n before 2.28.0 (and before 2.27.4 on the 2.27.x branch) registers the DELETE /${restEndpoint}/test-webhook/:id endpoint before authentication middleware is applied, allowing any unauthenticated network caller who knows a workflow ID to cancel that workflow's active test webhook registration. The impact is limited to disrupting in-progress test sessions; production webhooks, persistent workflow state, and stored data are not affected.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
n8n before 2.28.0 Authentication Bypass via test-webhook
n8n before 2.28.0 (and before 2.27.4 on the 2.27.x branch) registers the DELETE /${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.
- Record
CVE-2026-65014- CVSS 4.0
- 6.3 Medium
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 - Weakness
- CWE-306
- Updated
- 2026-11-02
EUVDEUVD-2026-47630
n8n before 2.28.0 (and before 2.27.4 on the 2.27.x branch) registers the DELETE /${restEndpoint}/test-webhook/:id endpoint before authentication middleware is applied, allowing any unauthenticated network caller who knows a workflow ID to cancel that workflow's active test webhook registration. The impact is limited to disrupting in-progress test sessions; production webhooks, persistent workflow state, and stored data are not affected.
- Record
EUVD-2026-47630- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-33q9-f52j-gc75
n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhook
Impact
The DELETE /${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.
- Record
GHSA-33q9-f52j-gc75- CVSS 4.0
- 6.3 Medium
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 - Weakness
- CWE-306
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-h9fm-xcv2-qfw3
Duplicate Advisory: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhook
Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-33q9-f52j-gc75. This link is maintained to preserve external references.
Original Description
n8n before 2.28.0 (and before 2.27.4 on the 2.27.x branch) registers the DELETE /${restEndpoint}/test-webhook/:id endpoint before authentication middleware is applied, allowing any unauthenticated network caller who knows a workflow ID to cancel that workflow's active test webhook registration. The impact is limited to disrupting in-progress test sessions; production webhooks, persistent workflow state, and stored data are not affected.
- Record
GHSA-h9fm-xcv2-qfw3- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Weakness
- CWE-306
- Updated
- 2026-11-02
NVD
n8n before 2.28.0 (and before 2.27.4 on the 2.27.x branch) registers the DELETE /${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.
- Record
CVE-2026-65014- CVSS 4.0
- 6.3 Medium
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-306
- Updated
- 2026-11-02
OSV
n8n before 2.28.0 Authentication Bypass via test-webhook
n8n before 2.28.0 (and before 2.27.4 on the 2.27.x branch) registers the DELETE /${restEndpoint}/test-webhook/:id endpoint before authentication middleware is applied, allowing any unauthenticated network caller who knows a workflow ID to cancel that workflow's active test webhook registration. The impact is limited to disrupting in-progress test sessions; production webhooks, persistent workflow state, and stored data are not affected.
- Record
CVE-2026-65014- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N - Weakness
- CWE-306
- Updated
- 2026-11-02
OSVGHSA-33q9-f52j-gc75
n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhook
Impact
The DELETE /${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.
- Record
GHSA-33q9-f52j-gc75- CVSS 4.0
- 6.3 Medium
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 - Weakness
- CWE-306
- Updated
- 2026-11-02
OSVGHSA-h9fm-xcv2-qfw3
Duplicate Advisory: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhook
Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-33q9-f52j-gc75. This link is maintained to preserve external references.
Original 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.
- Record
GHSA-h9fm-xcv2-qfw3- CVSS 4.0
- 6.3 Medium
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Weakness
- CWE-306
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
n8nnpm |
before 2.27.4 | 2.27.4 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-65014 is a medium vulnerability (CVSS 6.3) in N8n, published July 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.59%, the 48th percentile. Fixed in n8n 2.27.4.
References
github.com/n8n-io/n8n/security/advisories/GHSA-33q9-f52j-gc75
vulncheck.com/advisories/n8n-before-authentication-bypass-via-test-webhook
nvd.nist.gov/vuln/detail/CVE-2026-65014