CVE-2026-107370: Improper Request Handling for Active Directory Logins in auth0-lock

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-13 · updated 2026-10-15
Weakness: CWE-532

Description

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.

Affected products

auth0-lock: from 10.9.0 before 13.2.1; from 14.0.0 before 15.0.2 — fixed in 13.2.1, 15.0.2

How to fix

Upgrade to a fixed version: auth0-lock 13.2.1, 15.0.2. Check the vendor advisory for mitigations.

References

https://github.com/auth0/lock/security/advisories/GHSA-mp8m-wcxp-w648
https://trust.okta.com/security-advisories/improper-request-handling-for-active-directory-logins-in-auth0-lock-cve-2026-107370

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