n8n before 2.28.0 Authentication Bypass via test-webhook
Published Jul 22, 2026
6.3
MEDIUMCVSS 4.0
EPSS 0.59%
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 products
-
- Version 0StatusaffectedConstraints<2.27.4
- Version 0StatusaffectedConstraints<2.28.0
- Version 2.27.4StatusunaffectedConstraints-
- Version 2.28.0StatusunaffectedConstraints-
- Version
No data.
No Red Hat product state for this CVE.
n8n
npm
Introduced 0 Fixed 2.27.4
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | n8n | 0 | 2.27.4 |
Remediation
No remediation recorded yet.
Metrics
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
1 other source (NVD) ▾
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/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Jul 22, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
Jul-Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 0.59% (0.00590) | 46.33th | v5 (v2026.06.15) |
| Jul 23, 2026 | 0.57% (0.00567) | 43.59th | v5 (v2026.06.15) |
References (6)
- https://github.com/advisories/GHSA-33q9-f52j-gc75 Advisory
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.27.4
- https://github.com/n8n-io/n8n/releases/tag/n8n@2.28.0
- https://github.com/n8n-io/n8n/security/advisories/GHSA-33q9-f52j-gc75 vendor-advisoryMitigationVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-65014
- https://www.vulncheck.com/advisories/n8n-before-authentication-bypass-via-test-webhook third-party-advisoryThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/advisories/GHSA-33q9-f52j-gc75 | Advisory | |
| https://github.com/n8n-io/n8n/releases/tag/n8n@2.27.4 | ||
| https://github.com/n8n-io/n8n/releases/tag/n8n@2.28.0 | ||
| https://github.com/n8n-io/n8n/security/advisories/GHSA-33q9-f52j-gc75 | vendor-advisoryMitigationVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-65014 | ||
| https://www.vulncheck.com/advisories/n8n-before-authentication-bypass-via-test-webhook | third-party-advisoryThird Party Advisory |
Change history (0)
No recorded changes yet.