The Auth0 authentication service before 2017-10-15 allows privilege escalation because the JWT audience is not validated.

The Auth0 Auth0.js library before 9.3 has CSRF because it mishandles the case where the authorization response lacks the state parameter.

CSRF exists in the Auth0 authentication service through 14591 if the Legacy Lock API flag is enabled.

A cross-origin vulnerability has been discovered in the Auth0 auth0.js library affecting versions < 8.12. This vulnerability allows an attacker to acquire authenticated users' tokens and invoke services on a user's behalf if the target site or application uses a popup callback page with auth0.popup.callback().

auth0.js (NPM package auth0-js) greater than version 8.0.0 and before version 9.12.3 has a vulnerability. In the case of an (authentication) error, the error object returned by the library contains the original request of the user, which may include the plaintext password the user entered. If the error object is exposed or logged without modification, the application risks password exposure. This is fixed in version 9.12.3