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
.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:
flashMessage
feature.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);
OR
languageDictionary
feature.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: "[email protected]",
title: "title",
socialLoginInstructions: instruction
},
};
var lock = new Auth0LockPasswordless(
CLIENT_ID,
DOMAIN,
options
);
lock.show()
Upgrade to version 11.30.1
.
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.