Alta

Reflected XSS when using flashMessages or languageDictionary

Publicada: 04.06.2021
Actualizado: 11.10.2026 10:22

Overview

Versions before and including 11.30.0 are vulnerable to reflected XSS. An attacker can execute arbitrary code when the library's

flashMessage feature is utilized and user input or data from URL parameters is incorporated into the flashMessage.
languageDictionary feature is utilized and user input or data from URL parameters is incorporated into the languageDictionary.

Am I affected?

You are affected by this vulnerability if you are using auth0-lock version 11.30.0 or lower and all of the following conditions apply:

You are utilizing flashMessage feature.
User input or data from URL parameters is incorporated into the flashMessage.

An example of a vulnerable snippet where query parameters are used to populate the text property of a flashMessage.

var params = new URLSearchParams(location.search);
var errorMessage = params.get('error__message');
var showParams = {};

if (!!errorMessage === true) {
  showParams.flashMessage = {
    type: 'error',
    text: 'We were unable to log you in. ' + errorMessage,
  };
}

lock.show(showParams);

You are utilizing languageDictionary feature.
User input or data from URL parameters is used in languageDictionary properties.

An example of a vulnerable snippet where query parameters are used to populate the socialLoginInstructions property of a languageDictionary.

var params = new URLSearchParams(location.search);
var instruction = params.get('instruction');

var options = {
  languageDictionary: {
    emailInputPlaceholder: "something@youremail.com",
    title: "title",
    socialLoginInstructions: instruction
  },
};

var lock = new Auth0LockPasswordless(
    CLIENT_ID,
    DOMAIN,
    options
);

lock.show()

How to fix that?

Upgrade to version 11.30.1.

Will this update impact my users?

The fix uses DOMPurify to sanitise the flashMessage and languageDictionary inputs. If you are including inline JavaScript in these fields, like script tags or onclick attributes, these will be removed.

Software afectado

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Plataforma	Paquete	Versiones vulnerables	Corregida en
Paquete de npm	auth0-lock	< 11.30.1	11.30.1

Referencias

Puntuación CVSS 8.1/10

Vector CVSS: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Debilidad (CWE): CWE-79
Plataforma: npm
Paquete: auth0-lock
Publicada: 04.06.2021
Actualizado: 11.10.2026 10:22

Fuentes y licencias

OSV / GitHub Advisory Database - GHSA-jr3j-whm4-9wwm - CC BY 4.0

Historial de vulnerabilidades: auth0-lock

Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.

Entradas en total: 4
Primera → última: 01.2020 05.2022
Sin corrección: 0
Explotada en ataques: 0

Distribución por gravedad

Alta 1
Media 2
Baja 1

Divulgaciones por año

2020: 2
2021: 1
2022: 1
2023: 0
2024: 0
2025: 0
2026: 0

24.05.2022

Cross-site Scripting in Auth0 Lock

Media · 6.1 CVE-2022-29172 < 11.33.0 11.33.0
04.06.2021

Reflected XSS when using flashMessages or languageDictionary esta entrada

Alta · 8.1 CVE-2021-32641 < 11.30.1 11.30.1
19.08.2020

DOM-based XSS in auth0-lock

Baja · 6.4 CVE-2020-15119 < 11.26.3 11.26.3
31.01.2020

auth0-lock vulnerable to XSS via unsanitized placeholder property

Media · 6.1 CVE-2019-20174 < 11.21.0 11.21.0

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