CVE-2018-15131: Synacor Zimbra Collaboration Suite

Medium severity, CVSS 5.3. EPSS: 1.9% chance of exploitation in the next 30 days.

An issue was discovered in Synacor Zimbra Collaboration Suite 8.6.x before 8.6.0 Patch 11, 8.7.x before 8.7.11 Patch 6, 8.8.x before 8.8.8 Patch 9, and 8.8.9 before 8.8.9 Patch 3. Account number enumeration is possible via inconsistent responses for specific types of authentication requests.

Affected products

• Synacor Zimbra Collaboration Suite: from 8.7.0, before 8.7.11 (fixed in 8.7.11); from 8.8.0, before 8.8.8 (fixed in 8.8.8); version 8.6.0 only; version 8.7.11 only; version 8.8.8 only; version 8.8.9 only

Published 2019-05-30. Last modified 2026-06-17.