Zero-Day Advisory

Fortinet Discovers Jenkins Metadata Plugin Cross-Site Scripting Vulnerability


Fortinet's FortiGuard Labs has discovered a stored Cross-Site Scripting (XSS) vulnerability in Jenkins Metadata Plugin.

Jenkins is a self-contained Java-based program, ready to run out-of-the-box, with packages for Windows, Mac OS X and other Unix-like operating systems.

A stored XSS vulnerability has been discovered in Jenkins Metadata Plugin 1.1.0b and earlier versions. It is caused by inadequate filtering in the metadata configuration description. It allows users with permission to change metadata definitions to insert arbitrary HTML/Javascript into Jenkins pages.


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

Released Aug 01, 2018

Users should apply the solution provided by Jenkins.


Fortinet reported the vulnerability to Jenkins on July 31, 2018.

Jenkins confirmed the vulnerability on August 20, 2018.

Jenkins patched the vulnerability on September 25, 2018.


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.