Description
WordPress Plugin Ninja Forms Contact Form-The Drag and Drop Form Builder for WordPress is prone to multiple vulnerabilities, including cross-site scripting and CSV Injection vulnerabilities. Exploiting these issues could allow an attacker to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, allowing the attacker to steal cookie-based authentication credentials, or to execute arbitrary commands on the victim's system, by the use of Microsoft Excel DDE function, or to leak data via maliciously injected hyperlinks. WordPress Plugin Ninja Forms Contact Form-The Drag and Drop Form Builder for WordPress version 3.3.13 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 3.3.14.1 or latest
References
https://www.exploit-db.com/exploits/45234/
https://packetstormsecurity.com/files/148993/WordPress-Ninja-Forms-3.3.13-CSV-Injection.html
https://www.wordfence.com/blog/2018/08/ninja-forms-security-updates-what-you-need-to-know/
https://plugins.svn.wordpress.org/ninja-forms/trunk/readme.txt