The WooCommerce - Social Login plugin for WordPress is vulnerable to unauthenticated privilege escalation in all versions up to, and including, 2.7.3. This is due to a lack of brute force controls on a weak one-time password. This makes it possible for unauthenticated attackers to brute force the one-time password for any user, except an Administrator, if they know the email of user.
The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.