Email Subscribers & Newsletters plugin contains an unauthenticated timebased SQL injection in versions before 4.3.1. The hash parameter is vulnerable to injection.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use auxiliary/scanner/http/wp_email_sub_news_sqli
msf auxiliary(wp_email_sub_news_sqli) > show actions
...actions...
msf auxiliary(wp_email_sub_news_sqli) > set ACTION < action-name >
msf auxiliary(wp_email_sub_news_sqli) > show options
...show and set options...
msf auxiliary(wp_email_sub_news_sqli) > run
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