Description
WordPress Plugin Ninja Forms Contact Form-The Drag and Drop Form Builder for WordPress is prone to multiple vulnerabilities, including arbitrary file upload, security bypass and PHP object injection vulnerabilities. Exploiting these issues could allow an attacker to upload arbitrary code and run it in the context of the webserver process, which may facilitate unauthorized access or privilege escalation or to perform otherwise restricted actions and subsequently change plugin settings. WordPress Plugin Ninja Forms Contact Form-The Drag and Drop Form Builder for WordPress versions from 2.9.36 and up to (and including) 2.9.42 are vulnerable.
Remediation
Update to plugin version 2.9.44 or latest
References
http://www.pritect.net/blog/ninja-forms-2-9-42-critical-security-vulnerabilities
https://packetstormsecurity.com/files/137211/WordPress-Ninja-Forms-Unauthenticated-File-Upload.html