Zero-Day Advisory

Fortinet Discovers Zimbra Collaboration Cross-Site Request Forgery Vulnerability


Fortinet's FortiGuard Labs has discovered a Cross-Site Request Forgery (CSRF) vulnerability in Zimbra Collaboration.

Zimbra Collaboration is an open, secure collaboration software suite for email, address book, calendar, file-sharing and tasks. According to its website, there are over 500 million people who are using Zimbra Collaboration and come from 135+ countries. Zimbra Collaboration is used by 500+ service providers, 1000+ government & financial institutions and 200k+ businesses. They include global brands such as NTT Communications, Comcast, Dell, Cadbury, Investec, Rackspace, Red Hat, VMware, H&R Block and Vodafone.

A CSRF vulnerability has been discovered in Zimbra Collaboration since 8.6.0. The vulnerability is caused due to less protection in the login progress. It allows remote attackers to launch CSRF attack against Zimbra Collaboration users.


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

Released Oct 09, 2015
Users should apply the solution provided by Zimbra.


Fortinet reported the vulnerability to Zimbra on September 24, 2015.

Zimbra confirmed the vulnerability on April 12, 2016.

Zimbra patched the vulnerability on April 12, 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.