Zero-Day Advisory

Fortinet Discovers RocketChat Rocket.Chat Cross Site Scripting


Fortinet's FortiGuard Labs has discovered a Cross Site Scripting vulnerability in RocketChat's Rocket.Chat.

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RocketChat's Rocket.Chat is susceptible to a Cross Site Scripting vulnerability. The issue occurs when the user input wrong command, the application show the error included user's input without escaping html.


Users should apply the solution provided by RocketChat


Fortinet reported the vulnerability to Rocket.Chat on 7 May, 2019

Rocket.Chat confirmed the vulnerability on 8 May, 2019

Rocket.Chat released patch for the vulnerability on 9 May, 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.