Anti-Malware Security and Brute-Force Firewall <= 4.21.96 - Unauthenticated Remote Code Execution

The Anti-Malware Security and Brute-Force Firewall plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 4.21.96 due to weak nonce generation combined with missing authorization. This makes it possible for unauthenticated attackers to brute force a valid nonce that can be used to add malware rule and execute code on the server.