The Freemius SDK, as used by hundreds of WordPress plugin and theme developers, was vulnerable to Cross-Site Request Forgery and Information disclosure due to missing capability checks and nonce protection on the _get_debug_log, _get_db_option, and the _set_db_option functions in versions up to, and including 2.4.2. Any WordPress plugin or theme running a version of Freemius less than 2.4.3 is vulnerable.

The SecuPress Free — WordPress Security plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.2.5.1. This is due to missing or incorrect nonce validation on the secupress_blackhole_ban_ip() function. This makes it possible for unauthenticated attackers to block a user's IP via a forged request granted they can trick the user into performing an action such as clicking on a link.

The WordPress Security Firewall, Malware Scanner, Secure Login and Backup plugin before 4.2.1 does not sanitise and escape some of its settings, leading to malicious users with administrator privileges to store malicious Javascript code leading to Cross-Site Scripting attacks when unfiltered_html is disallowed (for example in multisite setup)

Cross-site request forgery (CSRF) vulnerability in the All In One WP Security & Firewall plugin before 3.9.0 for WordPress allows remote attackers to hijack the authentication of administrators for requests that delete logs of 404 (aka Not Found) HTTP status codes.

SQL injection vulnerability in the All In One WP Security & Firewall plugin before 3.8.8 for WordPress allows remote attackers to execute arbitrary SQL commands via unspecified vectors.

Multiple SQL injection vulnerabilities in the All In One WP Security & Firewall plugin before 3.8.3 for WordPress allow remote authenticated users to execute arbitrary SQL commands via the (1) orderby or (2) order parameter in the aiowpsec page to wp-admin/admin.php. NOTE: this can be leveraged using CSRF to allow remote attackers to execute arbitrary SQL commands.