CVE-2018-10949: Synacor Zimbra Collaboration Suite

Medium severity, CVSS 5.3. EPSS: 2.4% chance of exploitation in the next 30 days.

mailboxd in Zimbra Collaboration Suite 8.8 before 8.8.8; 8.7 before 8.7.11.Patch3; and 8.6 allows Account Enumeration by leveraging a Discrepancy between the "HTTP 404 - account is not active" and "HTTP 401 - must authenticate" errors.

Affected products

• Synacor Zimbra Collaboration Suite: from 8.7.0, up to and including 8.7.11; from 8.8, before 8.8.8 (fixed in 8.8.8); version 8.6.0 only

Published 2018-05-10. Last modified 2026-06-17.