The Limit Login Attempts WordPress plugin through 1.7.2 does not sanitize and escape usernames when outputting them back in the logs dashboard, which could allow any authenticated users, such as subscriber to perform Stored Cross-Site Scripting attacks

The WP Limit Login Attempts WordPress plugin through 2.6.4 prioritizes getting a visitor's IP from certain HTTP headers over PHP's REMOTEADDR, which makes it possible to bypass IP-based restrictions on login forms.

The Limit Login Attempts (Spam Protection) WordPress plugin before 5.1 does not sanitise and escape some parameters before using them in SQL statements via AJAX actions (available to unauthenticated users), leading to SQL Injections

The Limit Login Attempts plugin before 1.7.1 for WordPress does not clear auth cookies upon a lockout, which might make it easier for remote attackers to conduct brute-force authentication attempts.

Multiple SQL injection vulnerabilities in the getip function in wp-limit-login-attempts.php in the WP Limit Login Attempts plugin before 2.0.1 for WordPress allow remote attackers to execute arbitrary SQL commands via the (1) X-Forwarded-For or (2) Client-IP HTTP header.