---
id: CVE-2026-107370
title: >-
  When a username for an Active Directory connection is a domain without a local
  part, the auth0-lock library initiates the authentication transaction with a
  GET request instead of a POST request
summary: >-
  When a username for an Active Directory connection is a domain without a local
  part, the auth0-lock library initiates the authentication transaction with a
  GET request instead of a POST request. As a result, user-submitted form data
  is a…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-532
  - CWE-598
vendor: Auth0
product: auth0-lock
affected:
  - auth0-lock >= 10.9.0 < 13.2.1
  - auth0-lock >= 14.0.0 < 15.0.2
published: '2026-10-13'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T20:38:04.303'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107370'
references:
  - url: 'https://github.com/auth0/lock/security/advisories/GHSA-mp8m-wcxp-w648'
    label: psirt@okta.com
  - url: >-
      https://trust.okta.com/security-advisories/improper-request-handling-for-active-directory-logins-in-auth0-lock-cve-2026-107370
    label: psirt@okta.com
tags:
  - nvd
  - cve.org
epss: 0.00281
epssPercentile: 0.20509
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-14T18:40:51.235220Z'
ingestedAt: '2026-10-13T21:58:14.177Z'
---

## Overview

When a username for an Active Directory connection is a domain without a local part, the auth0-lock library initiates the authentication transaction with a GET request instead of a POST request. As a result, user-submitted form data is appended to the URL as query string parameters.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.