The AdForest theme for WordPress is vulnerable to authentication bypass in all versions up to, and including, 5.1.6. This is due to the plugin not properly verifying a user's identity prior to authenticating them through the sb_login_user_with_otp_fun() function. This makes it possible for unauthenticated attackers to log in as arbitrary users, including administrators.
The product requires authentication, but the product has an alternate path or channel that does not require authentication.