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 Floating Notification Bar, Sticky Menu on Scroll, Announcement Banner, and Sticky Header for Any WordPress plugin before 2.7.2 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Cross-Site Scripting attacks even when unfiltered_html is disallowed

Numerous Plugins and Themes from the AccessPress Themes (aka Access Keys) vendor are backdoored due to their website being compromised. Only plugins and themes downloaded via the vendor website are affected, and those hosted on wordpress.org are not. However, all of them were updated or removed to avoid any confusion

The Scroll Baner WordPress plugin through 1.0 does not have CSRF check in place when saving its settings, nor perform any sanitisation, escaping or validation on them. This could allow attackers to make logged in admin change them and could lead to RCE (via a file upload) as well as XSS