Volerion logoVolerion
Volerion logoVolerion

Auth0 Lock Cross-Site Scripting Vulnerability in Additional Sign-Up Fields

Vulnerability

A cross-site scripting (XSS) vulnerability exists in Auth0 Lock versions prior to 11.21.0. The issue arises when the 'additionalSignUpFields' feature is used with an untrusted placeholder, allowing for the injection of malicious scripts.

Impact

Exploitation of this vulnerability allows for cross-site scripting, where an attacker can inject malicious scripts that are executed in the context of the user's browser.

Remediation

Users can upgrade to Auth0 Lock version 11.21.0 or later to address this vulnerability.

Added: Mar 11, 2026, 6:47 PM
Updated: Mar 11, 2026, 6:47 PM

Vulnerability Rating

Custom Algorithm
spread
0.0
impact
1.7
exploitability
5.8
remediation
7.7
relevance
0.0
threat
6.4
urgency
2.9
incentive
0.0

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.