Description
WordPress Plugin SMTP Mail is prone to an SQL injection vulnerability because it fails to sufficiently sanitize user-supplied data before using it in an SQL query. Exploiting this issue could allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database. WordPress Plugin SMTP Mail version 1.2.1 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 1.2.2 or latest
References
https://sploitus.com/exploit?id=WPEX-ID:FC50CF1A-00AE-4634-9B96-CBB6CED4651A
https://plugins.svn.wordpress.org/smtp-mail/trunk/readme.txt
Related Vulnerabilities
WordPress Plugin FavIcon Switcher Cross-Site Request Forgery (1.2.11)
WordPress 4.7.x Multiple Vulnerabilities (4.7 - 4.7.23)
WordPress Plugin YaMaps for WordPress Cross-Site Scripting (0.6.25)
WordPress Plugin Slider Revolution Responsive Local File Inclusion (4.1.4)
WordPress Plugin Email Subscribers & Newsletters Security Bypass (3.5.13)