CVE-2016-3403: Synacor Zimbra Collaboration Suite

High severity, CVSS 8.8. EPSS: 1.4% chance of exploitation in the next 30 days.

Multiple cross-site request forgery (CSRF) vulnerabilities in the Admin Console in Zimbra Collaboration before 8.6.0 Patch 8 allow remote attackers to hijack the authentication of administrators for requests that (1) add, (2) modify, or (3) remove accounts by leveraging failure to use of a CSRF token and perform referer header checks, aka bugs 100885 and 100899.

Affected products

• Synacor Zimbra Collaboration Suite: up to and including 8.6.0

Published 2017-05-17. Last modified 2026-06-17.