The WordPress Pirate Forms plugin (200,000+ active installations) was prone to an HTML injection vulnerability that could be used to target the administrator.
The WordPress Coming Soon Page and Maintenance Mode (7,000+ active installations), was prone to unauthenticated stored XSS and settings reset vulnerabilities in version 1.7.8 and below.
The WordPress Ocean Extra plugin, which has over 400,000 active installations, was prone to settings change and CSS injection vulnerabilities in version 1.5.8 and below.
The WordPress Shortlinks by Pretty Links plugin, which has over 200,000 active installations, was prone to stored XSS and CSV injection vulnerabilities in version 2.1.9 and below.
The WordPress Crelly Slider plugin, which has 20,000+ active installations, was prone to an authenticated arbitrary file upload vulnerability in version 1.3.4 and below.