The Loginizer Security and Loginizer plugins for WordPress are vulnerable to authentication bypass in all versions up to, and including, 1.9.2. This is due to insufficient verification on the user being returned by the social login token. This makes it possible for unauthenticated attackers to log in as any existing user on the site, such as an administrator, if they have access to the email and the user does not have an already-existing account for the service returning the token.
The Loginizer WordPress plugin before 1.7.9 does not escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin
init.php in the Loginizer plugin 1.3.8 through 1.3.9 for WordPress has Unauthenticated Stored Cross-Site Scripting (XSS) because logging is mishandled. This is fixed in 1.4.0.
Cross Site Request Forgery (CSRF) exists in the Blacklist and Whitelist IP Wizard in init.php in the Loginizer plugin before 1.3.6 for WordPress because the HTTP Referer header is not checked.