The Anti-Malware Security and Brute-Force Firewall WordPress plugin through 4.21.85 is prone to a PHP Object Injection vulnerability due to the unsafe use of unserialize() function. A potential attacker, authenticated as high privilege user could exploit this vulnerability by sending specially crafted requests to the web application containing malicious serialized input.
The Anti-Malware Security and Brute-Force Firewall WordPress plugin before 4.21.83 does not sanitise and escape some parameters before outputting them back in an admin dashboard, leading to Reflected Cross-Site Scripting
The Anti-Malware Security and Brute-Force Firewall WordPress plugin before 4.20.94 does not sanitise and escape the POST data before outputting it back in attributes of an admin page, leading to a Reflected Cross-Site scripting. Due to the presence of specific parameter value, available to admin users, this can only be exploited by an admin against another admin user.