Fortinet Discovers Joomla Proclaim Extension Cross-Site Scripting Vulnerability


Fortinet's FortiGuard Labs has discovered a Cross-Site Scripting (XSS) vulnerability in Joomla Proclaim (formerly known as Joomla Bible Study) Extension.

Proclaim is a Joomla system of a component, modules, and plugins designed to help church put study or sermon notes online and connect to a multitude of media content.

A XSS vulnerability has been discovered in Proclaim before version 9.2.8. The vulnerability is caused due to less protection in the media file upload process. It allows remote privileged attackers to launch XSS attack against Joomla users.


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

Released Jun 02, 2021

Upgrade to Proclaim v9.2.8 or higher version.


Fortinet reported the vulnerability to Proclaim development team on June 2, 2021.

Proclaim development team confirmed the vulnerability on June 2, 2021.

Proclaim development team patched the vulnerability on June 2, 2021.


This vulnerability was discovered by Zhouyuan Yang 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.