The UserPro plugin before 4.9.17.1 for WordPress, when used on a site with the "admin" username, allows remote attackers to bypass authentication and obtain administrative access via a "true" value for the up_auto_log parameter in the QUERY_STRING to the default URI.
https://wpvulndb.com/vulnerabilities/8950
https://codecanyon.net/item/userpro-user-profiles-with-social-login/5958681?s_rank=9