CVE-2016-3406: Synacor Zimbra Collaboration Suite

High severity, CVSS 8.8. EPSS: 0.9% chance of exploitation in the next 30 days.

Multiple cross-site request forgery (CSRF) vulnerabilities in Zimbra Collaboration before 8.7.0 allow remote attackers to hijack the authentication of unspecified victims via vectors involving (1) the Client uploader extension or (2) extension REST handlers, aka bugs 104294 and 104456.

Affected products

• Synacor Zimbra Collaboration Suite: up to and including 8.6.0

Published 2017-01-18. Last modified 2026-06-17.