Zero-Day Advisory

Fortinet Discovers WordPress YOP Poll Plugin Cross-Site Scripting Vulnerability

Summary

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


WordPress YOP Poll is a versatile plugin with over 20,000 active installations. The plugin allows you to easily integrate a survey in your blog post/page and to manage the polls from within your WordPress dashboard.


The XSS vulnerability exists in the Admin preview module (version 6.3.0) where an user with low privileges is allowed to execute arbitrary script code within the context of the application. This vulnerability exists due to insufficient validation of create_yop_poll parameters.

Solutions

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

WordPress.YOP.Poll.Plugin.CVE-2021-24833.XSS
Released Jul 29, 2021

Upgrade to the version 6.3.1 or above.


Timeline

Fortinet reported the vulnerability to YOP Poll Team on July 15, 2021.

YOP Poll Team confirmed the vulnerability on July 19, 2021.

YOP Poll Team fixed the vulnerability on September 26, 2021.

Acknowledgement

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.