Fortinet Discovers WordPress Metaslider Plugin Cross-Site Scripting Vulnerability


Fortinet's FortiGuard Labs has discovered a cross-site scripting (XSS) vulnerability in WordPress Metaslider Plugin.

Wordpress Metaslider is a most popular slider plugin with over 800,000 active installations. This plugin offers powerful, SEO-optimized slideshows in minutes.

A stored cross-site scripting vulnerability has been discovered in Metaslider plugin (version 3.17.1) . The vulnerability exists in Image caption or description parameter in slide creation module.


FortiGuard Labs released the following FortiGate IPS signature which covers this specific vulnerability:

Released Sep 03, 2020

Update to the version  3.17.2 or above.


Fortinet reported the vulnerability to Metaslider Team on August 24, 2020 

Metaslider Team confirmed the vulnerability on August 25, 2020 

Metaslider Team fixed the vulnerability on August 28, 2020


This vulnerability was discovered by Vishnupriya Ilango of Fortinet's FortiGuard Labs.

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.