CVE-2023-37580: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability

Medium severity, CVSS 6.1. Actively exploited: in CISA KEV since 2023-07-27. EPSS: 49.1% chance of exploitation in the next 30 days.

Zimbra Collaboration (ZCS) 8 before 8.8.15 Patch 41 allows XSS in the Zimbra Classic Web Client.

Affected products

• Synacor Zimbra Collaboration Suite: from 8.8.0, before 8.8.15 (fixed in 8.8.15); version 8.8.15 only

Published 2023-07-31. Last modified 2026-06-17.