Zero-Day Advisory

Fortinet Discovers OpenProject Wiki Tabnabbing Vulnerability


Fortinet's FortiGuard Labs has discovered a Tabnabbing Vulnerability in OpenProject.

OpenProject is a web-based project management system for location-independent team collaboration.

OpenProject is susceptible to Tabnabbing vulnerability. The issue occurs when the server allows attacker input "target=_blank" to HTML anchor tag without rel noopener attribute which can result in attacker controlling victim's browser.


Users should apply the solution provided by OpenProject


Fortinet reported the vulnerability to OpenProject on 29 November, 2019. 

OpenProject confirmed the vulnerability on 5 December, 2019. 

OpenProject released patch for the vulnerability on 11 December, 2019.


This vulnerability was discovered by Nguyen Thanh Nguyen 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.