Zero-Day Advisory

Fortinet Discovers WordPress All-in-One SEO Pack Plugin Cross-Site Scripting Vulnerability


Fortinet's FortiGuard Labs has discovered a Cross-Site Scripting (XSS) vulnerability in the WordPress All-in-One SEO Pack plugin.
The All-in-One SEO Pack plugin is one of the most downloaded plugins for WordPress (almost 30 million downloads). It can automatically optimize your WordPress blog site for SEO (Search Engine Optimization).

The vulnerability exists due to insufficient sanitization of config file imports. It can be exploited to launch XSS attack.


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

Released May 04, 2016

FortiWeb can cover this specific vulnerability with following signatures:

Cross Site Scripting 010000000

Cross Site Scripting (Extended) 020000000

Users should apply the solution provided by the vendor.

Additional Information

The vulnerability was fixed in version 2.3.5. 


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.