Description
WordPress Plugin WP Mail SMTP by WPForms is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input. An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks. WordPress Plugin WP Mail SMTP by WPForms version 1.3.3 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 1.4.0 or latest
References
https://www.ripstech.com/php-security-calendar-2018/#day-2
https://plugins.svn.wordpress.org/wp-mail-smtp/trunk/readme.txt
Related Vulnerabilities
OpenSSL Uncontrolled Resource Consumption Vulnerability (CVE-2016-6307)
Lighttpd Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2008-1111)
WordPress Plugin Asset Manager 'upload.php' Arbitrary File Upload (0.3)
WordPress Plugin Link Library Cross-Site Scripting (5.9.12.29)