CVE-2026-65014: n8n Unauthenticated Endpoint Allows Cancellation Of Vulnerability

MODERATE
Advisory Identifier: GHSA-33q9-f52j-gc75
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CWE-306
Published
Advisory Summary

CVE-2026-65014 is a MODERATE unauthenticated endpoint allows cancellation of vulnerability (CWE-306: Missing Authentication for Critical Function) affecting n8n libraries in the npm ecosystem. The issue involves unauthenticated endpoint allows cancellation of any user's active test webhook. Remediation is available by upgrading affected packages to version 2.27.4.

CVE-2026-65014 at a Glance

CVE Identifier CVE-2026-65014
GHSA Identifier GHSA-33q9-f52j-gc75
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-306: Missing Authentication for Critical Function
Affected Product n8n
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-65014

To remediate this vulnerability, upgrade all affected n8n dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

n8n fixed: 2.27.4 
npm install n8n@2.27.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls n8n

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-65014, inspect your project dependencies using npm:

npm ls n8n

Analyze the terminal output to locate any version of n8n in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.27.4), your application is affected.

Note: The npm ls n8n command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-306: Missing Authentication for Critical Function, where the product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. In n8n, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## 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.

CVE-2026-65014 Affected n8n Versions

1 component(s)
Fixed Versions:
2.27.4
Product / Package Ecosystem Affected Versions Fixed Version
n8n
npm/n8n
npm
< 2.27.4
2.27.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/n8n-io/n8n/security/advisories/GHSA-33q9-f52j-gc75
NVD — CVE-2026-65014 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-65014
n8n Source Repository REPOSITORY
https://github.com/n8n-io/n8n
n8n Release RELEASE
https://github.com/n8n-io/n8n/releases/tag/n8n@2.27.4
n8n Release RELEASE
https://github.com/n8n-io/n8n/releases/tag/n8n@2.28.0
www.vulncheck.com/advisories/n8n-befo... WEB
https://www.vulncheck.com/advisories/n8n-before-authentication-bypass-via-test-webhook

Frequently Asked Questions

What is CVE-2026-65014?
CVE-2026-65014 is a security vulnerability in n8n involving Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhook under CWE-306: Missing Authentication for Critical Function.
Which n8n versions are affected?
Affected versions include releases prior to 2.27.4 across affected packages: n8n.
What version fixes CVE-2026-65014?
Upgrading to 2.27.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is n8n affected?
Yes, n8n is affected in releases prior to 2.27.4. Upgrade your dependency to 2.27.4 or later.
What CWE is associated with CVE-2026-65014?
CVE-2026-65014 is classified under CWE-306: Missing Authentication for Critical Function (The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.).
How can I check npm dependencies for CVE-2026-65014?
Run the dependency tree command: 'npm ls n8n'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-33q9-f52j-gc75",
  "modified" : "2026-07-22T22:36:10Z",
  "published" : "2026-07-22T22:36:10Z",
  "aliases" : [ "CVE-2026-65014" ],
  "summary" : "n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test Webhook",
  "details" : "## Impact\nThe `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. \n\nThe impact is limited to disrupting in-progress test sessions. Production webhooks, persistent workflow state, and stored data are not affected.\n\n## Patches\nUsers should upgrade to the patched version once available to remediate the vulnerability.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Restrict network access to the n8n instance to fully trusted users only.\n- Place the n8n instance behind a reverse proxy or firewall that requires authentication before reaching the REST API.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "n8n"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.27.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/security/advisories/GHSA-33q9-f52j-gc75"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-65014"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/n8n-io/n8n"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/releases/tag/n8n@2.27.4"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/releases/tag/n8n@2.28.0"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/n8n-before-authentication-bypass-via-test-webhook"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-306" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-22T22:36:10Z",
    "nvd_published_at" : null
  }
}