This e-book gives an overview of how to approach assessing WordPress plugins for vulnerabilities and common vectors of attack.
You can download it from the following link: https://packetstormsecurity.com/files/download/163010/howto-find-wordpress-plugin-vulnerabilities-wpscan-ebook-1.0.pdf
Source: https://packetstormsecurity.com/files/163010/How-To-Find-WordPress-Plugin-Vulns.html