CVE-2018-10939: Synacor Zimbra Collaboration Suite

Medium severity, CVSS 6.1. EPSS: 1.4% chance of exploitation in the next 30 days.

Zimbra Web Client (ZWC) in Zimbra Collaboration Suite 8.8 before 8.8.8.Patch4 and 8.7 before 8.7.11.Patch4 has Persistent XSS via a contact group.

Affected products

• Synacor Zimbra Collaboration Suite: from 8.7.0, up to and including 8.7.11; from 8.8.0, up to and including 8.8.8; version 8.7.11 only; version 8.8.8 only
• Zimbra Zimbra Collaboration Suite: version 8.8.8 only

Published 2018-05-30. Last modified 2026-06-17.